BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Do we live in the Best of all Worlds? - The fine tuning of the con
stants of Nature
DTSTART;VALUE=DATE-TIME:20160917T100000Z
DTEND;VALUE=DATE-TIME:20160917T103000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2235199@indico.cern.ch
DESCRIPTION:Speakers: Thomas Naumann (Deutsches Elektronen-Synchrotron (DE
))\nOn the occasion of the 300. anniversary of the death of G.W. Leibniz\n
\nEinstein once said: "What really interests me is whether God could have\
ncreated the world any differently." Our existence depends on a variety\no
f constants which appear to be extremely fine tuned to allow for the\nexis
tence of Life. These include the number of spatial dimensions\, the\nstren
gths of the forces\, the masses of the particles\, the composition of\nthe
Universe and others.\n\nOn the occasion of Leibniz' anniversary we discus
s the question of\nwhether we live in the "Best of all Worlds". The hypoth
esis of a\nmultiverse could explain the mysterious fine tuning of so many\
nfundamental quantities. Anthropic arguments are critically reviewed.\n\nh
ttps://indico.cern.ch/event/462870/contributions/2235199/
LOCATION:Maritime University of Szczecin Campus\, Szczerbcowa 4 Room 7
URL:https://indico.cern.ch/event/462870/contributions/2235199/
END:VEVENT
BEGIN:VEVENT
SUMMARY:How to justify the history of the universe?
DTSTART;VALUE=DATE-TIME:20160917T103000Z
DTEND;VALUE=DATE-TIME:20160917T113000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2235213@indico.cern.ch
DESCRIPTION:Speakers: Michael Heller (Vatican Astronomical Observatory\; C
opernicus Center\, Kraków\, Poland)\nThe laws of physics not only allow f
or\, but also enforce\, in a sense\, the origin of structures\, even of su
ch complex structures as living organisms. However\, they mercilessly watc
h the balance: the grow must remain in agreement with the second law of th
ermodynamics – everything has to tend to the thermodynamical equilibrium
\, that is to say to the thermal death. Even the most stable structures mu
st finally surrender to the statistical chaos. Physical evil: suffering\,
death\, decay\, find they raison d’etre in the structure of the Universe
. They are a price for the very possibility of life.\n But what about mora
l evil when\, for instance\, a human being\, making use of a physical evil
destroys another human being? Moral evil appeared in the history of the U
niverse together with a being able to choose between good and bad. Before
that there existed physical evil but the Universe was morally innocent. Th
e existence of moral evil does not find its raison d’etre in physical la
ws. It transcends physics.\n Among various attempts to answer Leibniz’s
question “Why is there something rather than nothing?” there is one\,
especially rich in consequences. It claims that something exists because i
t is good. This is an echo of Plato’s “the good and right … hold and
bring things together” (Phaedo). In this perspective\, existence and go
odness are interchangeable (esse and bonum convertuntur).\n If goodness ju
stifies existence then it also justifies rationality since everything that
exists is implacably rational. It follows that evil is irrational and as
such it cannot be rationally justified. This gap in rationality is tolerat
ed since the Universe with evil and freedom (to make evil) is supposedly b
etter than the Universe without evil and without freedom.\n This story is
told on canvas of a cosmological scenario.\n\nhttps://indico.cern.ch/event
/462870/contributions/2235213/
LOCATION:Maritime University of Szczecin Campus\, Szczerbcowa 4 Room 7
URL:https://indico.cern.ch/event/462870/contributions/2235213/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Predictions from the Quantum Multiverse
DTSTART;VALUE=DATE-TIME:20160916T093000Z
DTEND;VALUE=DATE-TIME:20160916T103000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2240711@indico.cern.ch
DESCRIPTION:Speakers: Laura Mersini-Houghton (University of North Carolina
at Chapel Hill\, USA)\nIn trying to understand the selection of the initi
al state of the universe\, physics is experiencing a paradigm shift on the
last decade. A multiverse extension of the standard model of cosmology is
now a promising and active direction of research. I will provide a brief
introduction of various efforts in extending cosmic inflation to a multive
rse origin. I will then describe in some detail how we can derive\, instea
d of postulating\, the selection of the initial state of the universe in
the context of my theory of the quantum multiverse\; and\, how\, informati
on about the origin of our universe can be revealed and tested with curren
t astrophysical data.\n\nhttps://indico.cern.ch/event/462870/contributions
/2240711/
LOCATION:
URL:https://indico.cern.ch/event/462870/contributions/2240711/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New constraints on spatial variations of the fine structure consta
nt from clusters of galaxies
DTSTART;VALUE=DATE-TIME:20160915T143500Z
DTEND;VALUE=DATE-TIME:20160915T150000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252613@indico.cern.ch
DESCRIPTION:Speakers: Ivan De Martino (Universidad del Pais Vasco)\nWe pro
pose an improved methodology to constrain spatial variations of the fine s
tructure constant using clusters of galaxies. We use the *Planck* 2013 dat
a to measure the thermal Sunyaev-Zeldovich effect at the location of 618 X
-ray selected clusters. We then use a Monte Carlo Markov Chain algorithm t
o obtain the temperature of the Cosmic Microwave Background at the locatio
n of our galaxy clusters. When fitting three different \nphenomenological
parameterizations allowing for monopole and dipole amplitudes in the value
of the fine structure constant we improve the results of earlier analysis
involving clusters and CMB power spectrum\, and we also found that the be
st-fit direction of a hypothetical dipole is compatible with the direction
of other known anomalies.\n\nhttps://indico.cern.ch/event/462870/contribu
tions/2252613/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252613/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tests of local Lorentz invariance of post-Newtonian gravity
DTSTART;VALUE=DATE-TIME:20160915T152500Z
DTEND;VALUE=DATE-TIME:20160915T155000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252566@indico.cern.ch
DESCRIPTION:Speakers: Lijing Shao (Albert Einstein Institute)\nGeneral rel
ativity (GR) is the current tour de force of gravitation that passes all e
xperimental scrutinies with great precision. However\, the difficult in in
corporating quantum principles motives alternative theories beyond GR. Som
e of these theories predict the breakdown of local Lorentz invariance. Sta
ndard-model extension (SME) is a convenient effective-theoretic framework
to study such possibilities from experiments. I will talk about lunar-lase
r-ranging\, atom-interferometry\, pulsar-timing experiments that probe pos
t-Newtonian effects in SME.\n\nhttps://indico.cern.ch/event/462870/contrib
utions/2252566/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252566/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Causality for nonlocal phenomena
DTSTART;VALUE=DATE-TIME:20160916T143500Z
DTEND;VALUE=DATE-TIME:20160916T150000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252672@indico.cern.ch
DESCRIPTION:Speakers: Tomasz Miller (Warsaw University of Technology)\nThe
talk will be based on a joint work with M. Eckstein (arXiv:1510.06386)\,
in which we propose and study an extension of the causal precedence relati
on onto the space of Borel probability measures on a given spacetime. The
developed formalism draws from the mathematical theory of optimal transpor
t and rigorously codifies the intuition of a subluminal probability flow.
This will be illustrated with several conditions\, which are all equivalen
t provided the spacetime has a sufficiently robust causal structure. An ap
plication in the study of causality in quantum theory will be discussed.\n
\nhttps://indico.cern.ch/event/462870/contributions/2252672/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252672/
END:VEVENT
BEGIN:VEVENT
SUMMARY:High-precision limit on variation in the fine-structure constant f
rom a single quasar absorption system
DTSTART;VALUE=DATE-TIME:20160915T122500Z
DTEND;VALUE=DATE-TIME:20160915T125000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252568@indico.cern.ch
DESCRIPTION:Speakers: Srdan Kotus (Centre for Astrophysics and Supercomput
ing Swinburne University)\nIn the last 15 years\, studies of velocity shif
ts between metal transitions observed in high-resolution quasar spectra wi
th the largest optical telescopes identified possible evidence for variati
on in the fine-structure constant\, $\\alpha$. Recent ‘supercalibration
’ techniques have shown that these spectra likely have significant syste
matic distortions in their wavelength scales that undermine the $\\Delta\\
alpha/\\alpha$ measurements.\n\nWe have selected the brightest southern qu
asar HE 0515$-$4414 at $z_\\text{abs}>1$ to obtain the highest $\\text{S/N
}$ spectrum available\, achieve the smallest statistical error on $\\Delta
\\alpha/\\alpha$ to date and\, most importantly\, to allow systematic effe
cts to be tracked and corrected with high fidelity. For this purpose we ha
ve combined HE 0515$-$4414 spectra observed with UVES/VLT over 10 years\,
producing an extremely high signal-to-noise ratio spectrum (peaking at $\\
text{S/N}\\approx250$ pix$^{-1}$). This provides the most precise measurem
ent of $\\Delta\\alpha/\\alpha$ from a single absorption system to date\,
$\\Delta\\alpha/\\alpha=-1.42\\pm0.55_{\\rm stat}\\pm0.65_{\\rm sys}$ part
s per million (ppm). This has a similar precision to previous measurements
from large samples of $\\sim$150 absorption systems. This measurement is
corrected for the largest systematic effect present in all (except one) pr
evious measurements\, the long-range wavelength distortions\, which would
add 10 ppm to the systematic error budget. We also discuss how our methods
for correcting the spectra\, in this case\, can be applied to future spec
tra\, in particular from the upcoming ESPRESSO spectrograph. Our spectrum
also offers a preview of the data quality available from the next generati
on of telescopes\, but also the problems that must be overcome to access t
he full photon-limited precision.\n\nhttps://indico.cern.ch/event/462870/c
ontributions/2252568/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252568/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lemaitre class dark energy model for relaxing cosmological constan
t
DTSTART;VALUE=DATE-TIME:20160913T152500Z
DTEND;VALUE=DATE-TIME:20160913T155000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252575@indico.cern.ch
DESCRIPTION:Speakers: Anna Dobosz (University of Warmia and Mazury)\n1. On
e-horizon spacetimes.\n2. Holographic principle. \n3. Spacetime singled ou
t by evaporation of the cosmological horizon.\n4. Lemaitre class model for
relaxing cosmological constant.\n5. Cosmological evolution. \n6. Anisotro
py.\n\nhttps://indico.cern.ch/event/462870/contributions/2252575/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252575/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Artifical intelligence applied to the automated analysis of absorp
tion spectra.
DTSTART;VALUE=DATE-TIME:20160915T125000Z
DTEND;VALUE=DATE-TIME:20160915T131500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252586@indico.cern.ch
DESCRIPTION:Speakers: Matthew Bainbridge (University of Leicester)\nA new
and fully-automated method is presented for the analysis of high-resolutio
n absorption spectra (GVPFIT). The method has broad application but here
we apply it specifically to the problem of measuring the fine structure co
nstant at high redshift. For this we need objectivity and reproducibility
. Three numerical methods are unified into one ``artificial intelligence''
process: a genetic algorithm that emulates the Darwinian processes of rep
roduction\, mutation and selection\, non-linear least-squares with paramet
er constraints (VPFIT)\, and Bayesian model averaging. In this talk we ill
ustrate the method using a test-case\, the $z_{abs} = 1.8389$ absorber tow
ards the $z_{em} = 2.145$ quasar J110325-264515.\n\nhttps://indico.cern.ch
/event/462870/contributions/2252586/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252586/
END:VEVENT
BEGIN:VEVENT
SUMMARY:3-form cosmology: phantom behavior\, singularities and interaction
s
DTSTART;VALUE=DATE-TIME:20160913T141000Z
DTEND;VALUE=DATE-TIME:20160913T143500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252589@indico.cern.ch
DESCRIPTION:Speakers: João Morais (Universidad del País Vasco / Euskal H
erriko Unibertsitatea)\nThe latest cosmological observations by the Planck
collaboration (and combined with others) are compatible with a phantom li
ke behavior $(w\n\nhttps://indico.cern.ch/event/462870/contributions/22525
89/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252589/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vacuum dark energy and spacetime symmetry
DTSTART;VALUE=DATE-TIME:20160913T150000Z
DTEND;VALUE=DATE-TIME:20160913T152500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252572@indico.cern.ch
DESCRIPTION:Speakers: Irina Dymnikova (University of Warmia and Mazury)\n1
. Vacuum dark fluid presented by variable cosmological term\n \n [I. D
ymnikova\, Phys. Lett. B 472 (2000) 33\; I. Dymnikova\, Class. Quant. Grav
. 19 (2002) 725 (Honorable Mention-2001 of the Gravity Research Foundation
)\; I. Dymnikova and E. Galaktionov\, Phys. Lett. B 645 (2007) 358\; I.
Dymnikova\, Int. J. Mod. Phys. A 31 (2016) 1641005]\n\n2. Regular Cosmolog
ies with Vacuum Dark Energy\n \n 2.1 Regular Lemaitre class models \n
[I. Dymnikova\, A. Dobosz\, M. Filchenkov and A.Gromov\, Phys. Lett. B 506
(2001) 351\; \nK. A. Bronnikov\, A. Dobosz and I. Dymnikova\, Class. Quan
t. Grav. 20 (2003) 3797\; \nK. Bronnikov\, I. Dymnikova and E. Galaktionov
\, Class. Quantum Grav. 29 (2012) 095025] \n \n 2.2 T-models of the K
antowski-Sachs type with regular pre-bang R-regions\n [K. Bronnikov and I
. Dymnikova\, Class. Quant. Grav. 24 (2007) 5803]\n \n 2.3 Cosmologica
l model singled out by the holographic principle \n [I. Dymnikova\, Int.
J. Mod. Phys. D 21 (2012) 124007 (Honorable Mention-2012 of the Gravity R
esearch Foundation)]\n\n3. Regular Compact Objects with vacuum dark energy
(de Sitter Vacuum) interiors\n \n 3.1 Regular black holes with de Sit
ter vacuum interior\n [I. Dymnikova\, Gen. Rel. Grav. 24 (1992) 235 (Awa
rded by the Gravity Research Foundation in 1991)\; I. Dymnikova and B. S
oltysek\, Gen. Rel. Grav. 30 (1997) 1775\; \nI. Dymnikova and E. Galaktion
ov\, Class. Quant. Grav. 22 (2005) 2331]\n \n 3.2 Regular black hole r
emnants\, G-lumps and graviatoms\n [I. Dymnikova\, Int. J. Mod. Phys. D
5 (1996) 529\; I. Dymnikova and M. Korpusik\, \nPhys. Lett. B 685 (2010)
12\; I. Dymnikova and M. Korpusik\, Entropy 13 (2011) 1967\;\nI. Dymnikova
and M. Fil’chenkov\, Adv. High Energy Phys. 13 (2013) 746894 (2013)\;\n
I. Dymnikova and M. Khlopov\, Int. J. Mod. Phys. D 24 (2015) 1545002]\n
\n 3.3 Mass and spacetime symmetry\n [I. Dymnikova\, Class. Quant. G
rav. 19 (2002) 725 (Honorable Mention-2001 of the Gravity Research Foundat
ion)\; D. V. Ahluwalia and I. Dymnikova\, Int. J. Mod. Phys. D 12 (2003) 1
787 (Honorable Mention-2003 of the Gravity Research Foundation)\; I. Dymni
kova\, A. Sakharov and J. Ulbricht\, Adv. High Energy Phys. 14 (2014) 7078
12]\n\nhttps://indico.cern.ch/event/462870/contributions/2252572/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252572/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards quantum logic spectroscopy of molecular ions
DTSTART;VALUE=DATE-TIME:20160913T130000Z
DTEND;VALUE=DATE-TIME:20160913T133000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252582@indico.cern.ch
DESCRIPTION:Speakers: Piet Schmidt (PTB Braunschweig/LUH Hannover)\nPrecis
ion spectroscopy is a driving force for the development of our physical un
derstanding. A prime example is the search for variation of fundamental co
nstants in laboratory experiments through the repeated frequency compariso
n of highly accurate frequency standards. It is advantageous to compare st
andards with a large difference in sensitivity of their transitions to a c
hange in these fundamental constants. However\, only few atomic and molecu
lar systems of interest have been accessible for precision spectroscopy in
the past\, since they miss a suitable transition for laser cooling and in
ternal state detection. This restriction can be overcome in trapped ions t
hrough quantum logic spectroscopy. I will show how the internal state of a
molecular ion can be detected non-destructively on a co-trapped cooling i
on by implemented a quantum logic algorithm involving only coherent laser
manipulation on the molecular ion [1]. This represents a first step toward
s extending the exquisite control achieved over selected atomic species to
much more complex molecular ions. Steps towards high resolution spectrosc
opy of molecular ions with the goal of improving the model-independent upp
er bound on a variation of the proton-to-electron mass ratio will be prese
nted.\n\n[1] F. Wolf\, Y. Wan\, J. C. Heip\, F. Gebert\, C. Shi\, and P. O
. Schmidt\, Non-destructive state detection for quantum logic spectroscopy
of molecular ions\, Nature **530**\, 457–460 (2016).\n\nhttps://indico.
cern.ch/event/462870/contributions/2252582/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2252582/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Varying constant theories from thermodynamics perspective
DTSTART;VALUE=DATE-TIME:20160912T141000Z
DTEND;VALUE=DATE-TIME:20160912T144000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252234@indico.cern.ch
DESCRIPTION:Speakers: Hussain Gohar (University of Szczecin\, Poland)\nWe
formulate the basic framework of thermodynamical entropic force cosmology
which allows variation of the gravitational constant G and the speed of li
ght c. Some cosmological solutions are given and tested against combined o
bservational data (supernovae\, BAO\, and CMB). We observationally test th
at the fit of the data is allowed for the speed of light c growing and the
gravitational constant G diminishing during the evolution of the universe
. We also obtain a bound on the variation of c to be Δc / c ∝ $10^{-5}$
> 0 \, which is at least one order of magnitude weaker than the quasar sp
ectra observational bound.\n\nhttps://indico.cern.ch/event/462870/contribu
tions/2252234/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2252234/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constraint on transient variations of fine-structure constants wit
h optical atomic clocks
DTSTART;VALUE=DATE-TIME:20160913T141000Z
DTEND;VALUE=DATE-TIME:20160913T144000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252579@indico.cern.ch
DESCRIPTION:Speakers: Piotr Wcislo (Nicolaus Copernicus University in Toru
n)\nOne of possible scenarios predicts that the dark matter (DM) may have
a form of stable topological defects [1]. For nonzero DM coupling to stand
ard-model particles\, the encounter with such object would effectively res
ult in temporary variation of fundamental constants. Recently it was propo
sed by Derevianko and Pospelov [2] that the networks of correlated atomic
clocks may be used for such searches. For the class of optical clocks [3-7
] such measurements are mostly sensitive to the variations of the fine-str
ucture constant since the electronic transitions are used. We present firs
t experimental constraint on the coupling of transient DM coupling to stan
dard-model particles obtained with optical atomic clocks. In our measureme
nt [8] we used two non-separated strontium optical lattice clocks [9\,10].
In contrast to the approach given in Ref. [2] we do not measure a phase d
ifference between the clocks but the common signal in the readouts. Furthe
rmore the sensitivity of our method does not scale with the distance betwe
en the sensors hence can applied to both distant and non-separated sensors
. Our constraint already reaches the capability of a constellation of GPS
atomic clocks [2] and substantially exceeds previous laboratory and astrop
hysical limits [11].\n\n[1] A. Vilenkin\, Physics Reports 121\, 263 (1985)
.\n[2] A. Derevianko and M. Pospelov\, Nature Phys. 10\, 933 (2014).\n[3]
T. Rosenband et al.\, Science 319\, 1808 (2008).\n[4] C. W. Chou et al.\,
Phys. Rev. Lett. 104\, 070802 (2010).\n[5] N. Hinkley et al.\, Science 341
\, 1215 (2013).\n[6] R. Le Targat et al.\, Nat. Commun. 4\, 2109 (2013).\n
[7] B. J. Bloom et al.\, Nature 506\, 71 (2014).\n[8] P. Wcislo et al.\, A
rXiv e-prints (2016)\, arXiv:1605.05763 [physics.atom-ph].\n[9] M. Bober e
t al.\, Meas. Sci. Technol. 26\, 075201 (2015).\n[10] P. Morzyński et al.
\, Sci. Rep. 5\, 17495 (2015).\n[11] K. A. Olive and M. Pospelov\, Phys. R
ev. D 77\, 043524 (2008).\n\nhttps://indico.cern.ch/event/462870/contribut
ions/2252579/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2252579/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vacua and correlators on hyperbolic de Sitter sections
DTSTART;VALUE=DATE-TIME:20160913T123500Z
DTEND;VALUE=DATE-TIME:20160913T131000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252633@indico.cern.ch
DESCRIPTION:Speakers: Jan Pieter van der Schaar (University of Amsterdam)\
nKeywords:\n\n- Eternal inflation\n- Bubble nucleation\n- de Sitter space\
n- Entanglement\n\nhttps://indico.cern.ch/event/462870/contributions/22526
33/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252633/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Discord in de Sitter spacetime
DTSTART;VALUE=DATE-TIME:20160913T131000Z
DTEND;VALUE=DATE-TIME:20160913T134000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252621@indico.cern.ch
DESCRIPTION:Speakers: Jiro Soda (Kobe University)\nRecently\, quantum enta
nglement in the context of cosmology has been widely discussed. There are
many quantities which characterize quantumness of a state.Among such quant
ities\, quantum discord is often mentioned as the best one. In this talk\,
we discuss the quantum discord in de Sitter spacetime.\n\nhttps://indico.
cern.ch/event/462870/contributions/2252621/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252621/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effects from canonical quantum gravity for slow-roll inflationary
models
DTSTART;VALUE=DATE-TIME:20160912T143500Z
DTEND;VALUE=DATE-TIME:20160912T150000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252667@indico.cern.ch
DESCRIPTION:Speakers: David Brizuela (University of the Basque Country)\nT
he power spectrum of inflationary gauge-invariant perturbations is compute
d in the context of canonical quantum gravity for generic slow-roll models
. A semiclassical approximation\, based on an expansion on inverse powers
of the Planck mass\, is applied to the complete Wheeler-DeWitt equation de
scribing a perturbed inflationary universe. This expansion leads to a hier
archy of equations at consecutive orders of the approximation and allows u
s to write down a corrected Schrödinger equation that encodes information
about quantum-gravitational effects. The analytical dependence of the cor
rection to the power spectrum on the wavenumber is obtained. Nonetheless\,
some numerical work is needed in order to obtain its precise value. Final
ly\, it is shown that the correction turns out to be positive\, which lead
s to an enhancement of the power spectrum especially prominent for large s
cales.\n\nhttps://indico.cern.ch/event/462870/contributions/2252667/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252667/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Current status on dark energy singularities
DTSTART;VALUE=DATE-TIME:20160912T125000Z
DTEND;VALUE=DATE-TIME:20160912T131500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252668@indico.cern.ch
DESCRIPTION:Speakers: Mariam Bouhmadi-Lopez ()\nOn this talk\, we will pre
sent a review on dark energy singularities and abrupt events. We will star
t with a classical description of several models. On the second part of th
e talk\, we will focus on the quantum analysis of these singularities/abru
pt events. The analysis will encompass also modified theories of gravity.\
n\nhttps://indico.cern.ch/event/462870/contributions/2252668/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252668/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Perturbation vacua and primordial power spectra in Loop Quantum Co
smology
DTSTART;VALUE=DATE-TIME:20160912T150000Z
DTEND;VALUE=DATE-TIME:20160912T152500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252669@indico.cern.ch
DESCRIPTION:Speakers: Daniel Martin de Blas ()\nWe discuss the primordial
power spectra for both scalar and tensor perturbations in a inflationary m
odel quantized by means of the hybrid quantization in Loop Quantum Cosmolo
gy. In order to compute the primordial power spectra we use the effective
dynamics coming from the quantum theory and we neglect backreactions. As e
xpected\, the primordial power spectra obtained depend crucially in the in
itial conditions given for the perturbations (i.e. in the selected vacuum)
. We will show the results obtained for usual instances of adiabatic vacua
of different orders and for a new proposed vacua that minimize the tempor
al variation of the amplitude of the perturbations.\n\nhttps://indico.cern
.ch/event/462870/contributions/2252669/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252669/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On a nonlinear gravitational wave
DTSTART;VALUE=DATE-TIME:20160912T151000Z
DTEND;VALUE=DATE-TIME:20160912T154000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252652@indico.cern.ch
DESCRIPTION:Speakers: Hristu Culetu (Ovidius University)\nAn exact\, plane
wave solution of the gravitational field equations is investigated. The s
ource stress tensor is represented by an anisotropic null fluid with energ
y flux to which the energy density $\\rho$ and the pressure $p_{z}$ are ne
gative but finite throughout the spacetime. They depend on a constant leng
th (taken of the order of the Planck length) and acquire Planck values clo
se to the null surface $t - z = 0$\, z-axis being the direction of propaga
tion. The timelike geodesics of a test particle are contained in a plane w
hose normal has constant direction and the null trajectories are comoving
with a plane of fixed direction.\n\nhttps://indico.cern.ch/event/462870/co
ntributions/2252652/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252652/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Energy and momentum transferred by gravitational waves.
DTSTART;VALUE=DATE-TIME:20160912T144000Z
DTEND;VALUE=DATE-TIME:20160912T151000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252651@indico.cern.ch
DESCRIPTION:Speakers: Janusz Garecki (Institute of Mathematics\, Universit
y of Szczecin)\nThe all presentation is an updated version of my paper pri
nted in Annalen der Physik (Leipzig \, 11 (2002) 441-455. (ArXiv: gr-qc.01
02072). In this paper I have considered exact\, non-linear gravitational
waves in the framework of general relativity and showed that they transfer
energy-momentum and angular momentum.\n\nhttps://indico.cern.ch/event/462
870/contributions/2252651/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252651/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fundamental constants\, gravitation and cosmology – recent devel
opments
DTSTART;VALUE=DATE-TIME:20160912T071000Z
DTEND;VALUE=DATE-TIME:20160912T080500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2240725@indico.cern.ch
DESCRIPTION:Speakers: Jean-Philippe Uzan (Institut d’Astrophysique de Pa
ris (IAP)\, France)\nFundamental constants play a central role in the laws
of physics. Any detection of the variation of these constant would signal
a violation of the Einstein equivalence principle\, and thus the need to
go beyond general relativity. After recalling the links between fundamenta
l constants and theories of gravity\, I will focus on recent developments
to constrain their time variation\, mostly concentrating on big-bang and s
tellar nucleosynthesis as well as the analysis of the observations by the
Planck satellite. The connection with cosmology\, in particular the physic
s of the dark sector and fine tuning issues will be discussed.\n\nhttps://
indico.cern.ch/event/462870/contributions/2240725/
LOCATION:
URL:https://indico.cern.ch/event/462870/contributions/2240725/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spacetime variations of the varying alpha: The first 1000 high-pre
cision measurements
DTSTART;VALUE=DATE-TIME:20160915T070000Z
DTEND;VALUE=DATE-TIME:20160915T080000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2240726@indico.cern.ch
DESCRIPTION:Speakers: John Webb (UNSW)\nWe are preparing a large sample of
high-precision varying alpha measurements using quasar spectra. The measu
rements are being made using the new automated AI methodology described in
arXiv:1606.07393 which eliminates any important human bias. A detailed st
udy of long-range wavelength distortions in UVES/VLT and HIRES/Keck sample
s will also be described. I will show that such distortions are indeed pr
esent\, but do not explain the tentative spatial variation of alpha\, cont
rary to a previous claim. Moreover\, long range wavelength distortions can
be accurately measured using the quasar spectra themselves and hence can
be removed from the final set of alpha measurements.\n\nhttps://indico.cer
n.ch/event/462870/contributions/2240726/
LOCATION:
URL:https://indico.cern.ch/event/462870/contributions/2240726/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Frequency ratios of optical lattice clocks at the 17th decimal pla
ce
DTSTART;VALUE=DATE-TIME:20160913T070000Z
DTEND;VALUE=DATE-TIME:20160913T080000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2240712@indico.cern.ch
DESCRIPTION:Speakers: Hidetoshi Katori (University of Tokyo\, Japan)\nOpti
cal lattice clocks benefit from a low quantum-projection noise by simultan
eously interrogating a large number of atoms\, which are trapped in an opt
ical lattice tuned to the “magic wavelength” to largely cancel out lig
ht shift perturbation in the clock transition. About a thousand atoms enab
le the clocks to achieve $10^{-18}$ instability in a few hours of operatio
n\, allowing intensive investigation and control of systematic uncertainti
es. It is now the uncertainty of the SI second ($\\sim 10^{-16}$) itself t
hat restricts the measurement of the absolute frequencies of such optical
clocks. Direct comparisons of optical clocks are\, therefore\, the only wa
y to investigate and utilize their superb performance beyond the SI second
. \nIn this presentation\, we report on frequency comparisons of optical l
attice clocks with neutral strontium (${}^{87}$Sr)\, ytterbium (${}^{171}$
Yb) and mercury (${}^{199}$Hg) atoms. By referencing cryogenic Sr clocks [
1]\, we determine frequency ratios\, $\\nu_\\text{Yb}$/$\\nu_\\text{Sr}$ [
2] and $\\nu_\\text{Hg}$/$\\nu_\\text{Sr}$ [3]\, of a cryogenic Yb clock a
nd a Hg clock with uncertainty at the mid $10^{-17}$. Such ratios provide
an access to search for temporal variation of the fundamental constants. W
e also present remote comparisons between cryogenic Sr clocks located at R
IKEN and the University of Tokyo over a 30-km-long phase-stabilized fiber
link. The gravitational red shift Δν/$\\nu_0$ ≈ 1.1×$10^{-18}$ Δh cm
$^{-1}$ reads out the height difference of Δh~15 m between the two clocks
with uncertainty of 5 cm\, which demonstrates a step towards relativistic
geodesy. We also mention our ongoing experiments that reduce clock uncert
ainty to $10^{-19}$ by applying “operational magic frequency\,” [4]\,
where light shifts due to dipole\, multipolar\, and hyper-polarizability e
ffects effectively cancel out for a certain range of optical lattice inten
sity.\n\n[1] I. Ushijima\, et al.\, Nature Photon. 9\, 185 (2015).\n[2] N.
Nemitz\, et al.\, Nature Photon. 10\, 258 (2016).\n[3] K. Yamanaka\, et a
l.\, Phys. Rev. Lett. 114\, 230801 (2015).\n[4] H. Katori\, et al.\, Phys.
Rev. A 91\, 052503 (2015).\n\nhttps://indico.cern.ch/event/462870/contrib
utions/2240712/
LOCATION:
URL:https://indico.cern.ch/event/462870/contributions/2240712/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Varying constants\, cosmology and the puzzle of quantum gravity
DTSTART;VALUE=DATE-TIME:20160912T080500Z
DTEND;VALUE=DATE-TIME:20160912T090000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2240713@indico.cern.ch
DESCRIPTION:Speakers: João Magueijo (Imperial College\, London\, United K
ingdom)\nVarying constants theories in several guises may be essential for
the resolution of a number of impasses in cosmology and quantum gravity.
Perhaps the most radical of them all – varying c theories – may be the
clue to extracting phenomenology from quantum gravity theories\, finally
rendering the field properly a branch of science. I will review this possi
bility\, with particular emphasis on the issue of the generation of cosmic
structure and primordial gravitational waves.\n\nhttps://indico.cern.ch/e
vent/462870/contributions/2240713/
LOCATION:
URL:https://indico.cern.ch/event/462870/contributions/2240713/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark Matter\, Dark Energy\, Gravitational Waves and Black Holes
DTSTART;VALUE=DATE-TIME:20160916T080000Z
DTEND;VALUE=DATE-TIME:20160916T090000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2240724@indico.cern.ch
DESCRIPTION:Speakers: John Moffat (Perimeter Institute)\nThe standard mode
l of cosmology features three key theoretical paradigms:\n\n1) Inflation\n
2) Dark Matter\n3) Dark Energy (accelerated expansion of the universe)\n\n
Inflation has severe fine-tuning problems and the need for eternal inflati
on and a multiverse. The alternative model Variable Speed of Light Cosmol
ogy (VSL) can avoid these problems and fit available observational data. T
he CMB is described with remarkable success by the standard concordance mo
del\, based on six parameters. Of these the dark matter Ωm and dark ener
gy ΩΛ parameters are poorly understood. Dark matter particle candidates
have not been conclusively observed in the present universe in laboratory
and satellite experiments. Dark Energy can be explained by the cosmologica
l constant at the price of a huge fine-tuning problem. Moreover\, the assu
mptions of a homogeneous and isotropic LFRW universe and the Copernican pr
inciple have not been fully tested. A modified gravitation (MOG) theory wi
ll be reviewed that can explain the lack of direct non-gravitational detec
tion of Dark Matter in the present universe and its ability to fit galaxy
and galaxy cluster data will be described. The conservative explanation of
the accelerated expansion of the universe based on voids will be reviewed
. The LIGO-Virgo experimental detection of gravitational waves and Event H
orizon Telescope imaging of the supermassive black holes Sagittarius A* an
d M37 will be able to distinguish MOG black holes from the Schwarzschild a
nd Kerr black holes.\n\nhttps://indico.cern.ch/event/462870/contributions/
2240724/
LOCATION:
URL:https://indico.cern.ch/event/462870/contributions/2240724/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Search for varying constants and new physics from molecular hydrog
en
DTSTART;VALUE=DATE-TIME:20160913T080000Z
DTEND;VALUE=DATE-TIME:20160913T090000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2240705@indico.cern.ch
DESCRIPTION:Speakers: Wim Ubachs (VU University Amsterdam)\nThe spectrosco
py of molecular hydrogen can be used for a search into physics beyond the
Standard Model. Differences between the absorption spectra of the Lyman an
d Werner bands of H$_2$ as observed at high redshift and those measured in
the laboratory can be interpreted in terms of possible variations of the
proton-electron mass ratio $\\mu=m_p/m_e$ over cosmological history. Inves
tigation of some ten of such absorbers in the redshift range $z= 2.0-4.2$
yields a constraint of $|\\Delta\\mu/\\mu|\n\nhttps://indico.cern.ch/event
/462870/contributions/2240705/
LOCATION:
URL:https://indico.cern.ch/event/462870/contributions/2240705/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Observations of gravitational waves from binary black hole mergers
DTSTART;VALUE=DATE-TIME:20160914T070000Z
DTEND;VALUE=DATE-TIME:20160914T080000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2240707@indico.cern.ch
DESCRIPTION:Speakers: Andrzej Krolak (National Center for Nuclear Studies)
\nDetection of gravitational waves from mergers of two black holes is one
\nof the greatest discoveries of this century. It will open a new window o
n the Universe. \nI shall describe observations of these signals in the da
ta of LIGO detectors\nby consortium of LIGO Scientific Collaboration and V
irgo Collaboration.\nI shall present several aspects of this dicovery: gra
vitational wave detectors\, \nsignal modeling and data analysis. I shall m
ention the follow-up observations of this \nevent by radio\, optical\, nea
r-infrared\, X-ray\, and gamma-ray wavelengths \nwith ground- and space-ba
sed facilities.\nI shall describe consequences of this result for physics
of fundamental interactions.\n\nhttps://indico.cern.ch/event/462870/contri
butions/2240707/
LOCATION:
URL:https://indico.cern.ch/event/462870/contributions/2240707/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New\, precise and reliable quasar absorption limits on alpha-varia
tion
DTSTART;VALUE=DATE-TIME:20160915T080000Z
DTEND;VALUE=DATE-TIME:20160915T090000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252565@indico.cern.ch
DESCRIPTION:Speakers: Michael Murphy (Swinburne University of Technology)\
nPrevious evidence for time and space variations in the fine-structure con
stant (alpha) emerged from large samples of quasar spectra observed with t
he Very Large Telescope and Keck telescope. I will first review this evide
nce in light of our work that identified systematic wavelength calibration
errors in these telescopes. These errors are subtle\, complex and still n
ot fully understood\; they clearly change with time\, making it difficult
to estimate the detailed effect they had on the quasar spectra. Neverthele
ss\, I will argue that they are likely to explain the previous evidence fo
r variations in alpha\, and at least substantially weaken that evidence.\n
\nSecondly\, I will describe new observations and measurements which are c
orrected for\, or are insensitive to\, these calibration errors. In partic
ular\, I will report 11 new such measurements which\, combined\, constrain
the relative deviation in alpha to be $\\Delta\\alpha/\\alpha = 0.4 \\pm
1.7$ parts-per-million from the current laboratory value at redshifts 1.0
–2.4 (look-back times of 7.8–11 billion years). This is consistent wit
h no variation in alpha at a precision level comparable to that of the two
large quasar samples. However\, the particular distribution of these quas
ars on the sky precludes a strong test of possible evidence variation in a
lpha across the sky in those large samples (ignoring the calibration error
s above). I will report on progress towards several new measurements that\
, combined with those reported here\, should enable such a test.\n\nhttps:
//indico.cern.ch/event/462870/contributions/2252565/
LOCATION:Maritime University of Szczecin Campus\, Szczerbcowa 4 Room 7
URL:https://indico.cern.ch/event/462870/contributions/2252565/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fundamental cosmology in the E-ELT era
DTSTART;VALUE=DATE-TIME:20160915T093000Z
DTEND;VALUE=DATE-TIME:20160915T103000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2240723@indico.cern.ch
DESCRIPTION:Speakers: Carlos Martins (University of Porto)\nThe observatio
nal evidence for the recent acceleration of the universe demonstrates that
canonical theories of cosmology and particle physics are incomplete (and
possibly incorrect) and that new physics is out there\, waiting to be disc
overed. The most fundamental task for the next generation of astrophysical
facilities is to search for\, identify and ultimately characterize this n
ew physics. I will highlight the E-ELT's key role in this quest. After a s
hort overview of theoretical motivations for new physics\, the discussion
will focus on precision spectroscopy tests of fundamental physics and cosm
ology. I will summarize the current status of these tests\, discuss a clas
sification of physically motivated models\, and present some forecasts of
the improvements that the E-ELT will enable (comparing them to ESPRESSO wh
en appropriate). Time permitting I will also briefly comment on synergies
with other E-ELT instruments\, and with other facilities such as ALMA and
Euclid.\n\nhttps://indico.cern.ch/event/462870/contributions/2240723/
LOCATION:
URL:https://indico.cern.ch/event/462870/contributions/2240723/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Disformal electrodynamics: from varying alpha to vacuum Cherenkov
radiation
DTSTART;VALUE=DATE-TIME:20160916T070000Z
DTEND;VALUE=DATE-TIME:20160916T080000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2240706@indico.cern.ch
DESCRIPTION:Speakers: Carsten van de Bruck (University of Sheffield)\nIn s
calar-tensor theories the gravitational sector is extended by including an
additional scalar degree of freedom. The most general metric that can be
built in such a theory includes disformal terms so that standard model fie
lds move on a metric which is the sum of the space time metric and a tenso
r constructed from first derivatives of the scalar. In such a theory gravi
tational waves and photons can propagate at different speeds\, and these c
an in turn be different from the maximum speed limit for matter particles.
As I will discuss\, disformal couplings can cause charged particles to em
it Cherenkov radiation and bremsstrahlung apparently in vacuum\, depending
on the background evolution of the scalar field. In addition\, the fine s
tructure constant becomes time-dependent. I will discuss the implications
of such a model in detail and discuss the constraints that arise for mode
ls of dark energy with disformal couplings.\n\nhttps://indico.cern.ch/even
t/462870/contributions/2240706/
LOCATION:
URL:https://indico.cern.ch/event/462870/contributions/2240706/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Observational consequences of an interacting multiverse
DTSTART;VALUE=DATE-TIME:20160916T131000Z
DTEND;VALUE=DATE-TIME:20160916T134000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2254190@indico.cern.ch
DESCRIPTION:Speakers: Salvador Robles-Perez (IFF-EEBM)\nThe paradigm of an
interacting multiverse opens the door to a new wide variety of cosmic phe
nomena to be explored. In this talk\, we shall show that the interactions
among the universes of the multiverse may change the global properties of
the universes without violating their notion of causal closure (in the loc
al sense). These changes would eventually have observational consequences
on the properties of the universes\, some of which turn out to be distingu
ishable and distinctive of the multiverse. Thus\, the interacting multiver
se turns out to be testable\, a feature that was probably untenable not so
many years ago. We shall also analyse different processes that can be giv
en in the interacting multiverse like the creation of the universes in ent
angled pairs\, the appearance of a landscape-like structure of vacuum stat
es\, or the effective modification of the value of the field potential\, a
mong others.\n\nhttps://indico.cern.ch/event/462870/contributions/2254190/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2254190/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Relation Between Fundamental Constants and Particle Physics Pa
rameters
DTSTART;VALUE=DATE-TIME:20160912T120000Z
DTEND;VALUE=DATE-TIME:20160912T124000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252551@indico.cern.ch
DESCRIPTION:Speakers: Rodger Thompson (University of Arizona\, Steward Obs
ervatory)\nAstronomical observations provide constraints on the time varia
tion of the fundamental constants\, the proton to electron mass ratio and
the fine structure constant. These constants are dependent on particular
combinations of the Quantum Chromodynamic Scale\, the Higgs Vacuum Expect
ation Value and the Yukawa Couplings. The coefficients of these particle
physics parameters are model dependent but can be calculated from the mode
l. The observational constraints on the time variation of the two fundame
ntal constants therefore constrain the time variation of the combination o
f the three particle physics parameters. The proton to electron mass rati
o and the fine structure constant provide two equations in the three parti
cle physics parameters therefore one of the parameters can be eliminated p
roviding a two parameter constraint. Both fundamental constants depend on
the Quantum Chromodynamic Scale and the sum of the Higgs VEV and the Yukaw
a coupling. This makes it possible to solve for the QCD Scale and the sum
of the Higgs VEV and Yukawa coupling separately placing a direct constrai
nt on the QCD scale. Candidates for a third equation to constrain the Higg
s VEV and Yukawa coupling individually will be discussed. Even with just
the two equations the fundamental constants provide significant restrictio
ns to the parameter space of theories that postulate that the particle phy
sics parameters should be time variable.\n\nhttps://indico.cern.ch/event/4
62870/contributions/2252551/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2252551/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diatomic molecules as probes for variation of fundamental constant
s
DTSTART;VALUE=DATE-TIME:20160912T124000Z
DTEND;VALUE=DATE-TIME:20160912T131000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252552@indico.cern.ch
DESCRIPTION:Speakers: Anastasia Borschevsky (University of Groningen)\nDia
tomic molecules are very promising probes for variation of fundamental con
stants (VFC)\, as their spectra can be very sensitive to both α and μ\,
making it possible to look for change in both constants in a single experi
ment [1].\nNearly degenerate levels with different sensitivity to VFC may
provide huge enhancements of the relative variation\, since δω/ω tends
to infinity when the distance between the levels ω is close to zero. Howe
ver\, locating such fortuitous level combinations is not a trivial task. T
he talk will present some schemes for identifying rovibrational transition
s with optimal sensitivity to VFC in diatomic cations. Examples of promisi
ng molecules include cations of dihalogens and hydrogen halides\, which be
nefit from very low energy rovibrational transitions between the nearly de
generate sublevels of their X 2Π ground states [2]. \nSecond topic discus
sed in the presentation will be our recent investigation of sensitivity of
the equilibrium bond lengths in homonuclear dimers to variation of α [3
]\, in the context of the recent proposal to search for VFC using laser in
terferometers [4].\n\n[1] C. Chin\, V. V. Flambaum\, and M. G. Kozlov\, Ne
w J. Phys. 11\, 055048 (2009)\n\n[2] L. F. Pašteka\, A. Borschevsky\, V.V
. Flambaum\, and P. Schwerdtfeger\, Phys. Rev. A 92\, 012103 (2015)\n\n[3]
A. Borschevsky\, L. F. Pašteka\, V.V. Flambaum\, and P. Schwerdtfeger\,
in preparation\n\n[4] Y.V. Stadnik and V.V. Flambaum\, Phys. Rev. Lett. 11
4\, 161301 (2015)\n\nhttps://indico.cern.ch/event/462870/contributions/225
2552/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2252552/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Varying constants and cyclic universes
DTSTART;VALUE=DATE-TIME:20160912T144000Z
DTEND;VALUE=DATE-TIME:20160912T151000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252623@indico.cern.ch
DESCRIPTION:Speakers: Konrad Marosek (University of Szczecin)\nUsing the m
ethod of regularization of singularities due to varying constants\, I will
first discuss some proposals to construct the cyclic models of the univer
se which can be connected by standard and non-standard singularities. Then
\, on the footing of thermodynamics and the 2nd law I will discuss the cyc
lic multiverse models having different values of the fundamental constants
which can potentially exchange their entity due to quantum effects and qu
antum entanglement.\n\nhttps://indico.cern.ch/event/462870/contributions/2
252623/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2252623/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmology of the de Sitter Horndeski models
DTSTART;VALUE=DATE-TIME:20160916T120000Z
DTEND;VALUE=DATE-TIME:20160916T123500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252585@indico.cern.ch
DESCRIPTION:Speakers: Nelson Nunes (University of Lisbon)\nThe discovery\,
in 1998\, that the Universe is currently undergoing an \naccelerated expa
nsion is one of the greatest milestones in all physics. \nNaturally\, over
the last 17 years\, many proposals to explain this \nevolution have been
brought forward. Most ideas involve scalar field \ndark energy or extensio
ns of Einstein's gravity. These proposals are \nessentially phenomenologic
al without any relation to each other. One \nmajor step forward was the re
alization in 2011 that all these proposals are \nsubclasses of the most ge
neral scalar-tensor theory that leads to second \norder equations of motio
n\, the Horndeski Lagrangian. \n\nSeeking viable cosmological solutions\,
one can focus on the \nFriedmann-Lemaitre-Robertson-Walker spacetime and
search for cosmological \nmodels that have a late time flat de Sitter crit
ical point for any kind of material content or value of the vacuum energy.
Such models were attained and in this \nproceedings we address their p
henomenology following recent work.\n\nThe class of non-linear models with
shift symmetry are in a better footing when they are compared with curren
t observational constraints of the effective equation of state parameter a
nd limits on early dark energy contribution. In order to further scrutinis
e these models\, we are now required to face them against observables that
depend on the evolution of the field and matter fluid fluctuations.\n\nht
tps://indico.cern.ch/event/462870/contributions/2252585/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2252585/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effective gravitational "constant" in scalar-(curvature)tensor and
scalar-torsion gravities
DTSTART;VALUE=DATE-TIME:20160916T141000Z
DTEND;VALUE=DATE-TIME:20160916T144000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2255325@indico.cern.ch
DESCRIPTION:Speakers: Laur Järv (University of Tartu)\nCosmology papers a
rXiv:1003.1686\, 1006.1246\, 1112.5308\, 1411.1947\, 1511.03933\;\nPPN pap
ers arXiv:1309.0031\, 1607.?????.\n\nhttps://indico.cern.ch/event/462870/c
ontributions/2255325/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2255325/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modified gravity with vector distortion and cosmological applicati
ons
DTSTART;VALUE=DATE-TIME:20160916T131000Z
DTEND;VALUE=DATE-TIME:20160916T134000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2255327@indico.cern.ch
DESCRIPTION:Speakers: Jose Beltran Jimenez (Universite d'Aix-Marseille)\nI
will introduce a geometrical framework with a connection that is fully de
termined by a vector field as a generalization of Weyl geometry. Within th
ese geometries\, it is possible to formulate gravitational theories that l
ead to interesting vector-tensor theories with non-minimal couplings and d
erivative self-interactions such that the vector only propagates the 3 pol
arizations corresponding to a Proca field. I will discuss some cosmologica
l applications of these theories.\n\nhttps://indico.cern.ch/event/462870/c
ontributions/2255327/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2255327/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Observational Consequences of Scalar-tensor Entanglement During In
flation
DTSTART;VALUE=DATE-TIME:20160913T141000Z
DTEND;VALUE=DATE-TIME:20160913T144500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252827@indico.cern.ch
DESCRIPTION:Speakers: Nadia Bolis (UC Davis)\nWe consider the effects of e
ntanglement in the initial quantum state of scalar and tensor fluctuations
during inflation. We allow the gauge-invariant scalar and tensor fluctuat
ions to be entangled in the initial state and compute modifications to the
various cosmological power spectra. We compute the angular power spectra
($C_l$’s) for some specific cases of our entangled state and discuss wha
t signals one might expect to find in CMB data. This entanglement also can
break rotational invariance\, allowing for the possibility that some of t
he large scale anomalies in the CMB power spectrum might be explained by t
his mechanism.\n\nhttps://indico.cern.ch/event/462870/contributions/225282
7/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252827/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Post-Newtonian parameter in f(R) gravity
DTSTART;VALUE=DATE-TIME:20160916T144000Z
DTEND;VALUE=DATE-TIME:20160916T151000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2255324@indico.cern.ch
DESCRIPTION:Speakers: Masaaki Morita (Okinawa National College of Technolo
gy)\nWe derive a formula for the post-Newtonian parameter $\\gamma$ in $f(
R)$ gravity in a straightforward manner without using a scalar-tensor repr
esentation or the transformation to the Einstein frame. \n\nThe post-Newto
nian parameters\, defined in the parametrized post-Newtonian formalism\, h
ave been used in placing observational constraints on modified theories of
gravity with local gravity tests. \nIn $f(R)$ gravity\, it has been shown
that $\\gamma \\approx 1/2$ for the case of light mass of the field $\\pa
rtial_{R} f$\, which is manifestly inconsistent with the constraint $|\\ga
mma -1| \\leq 10^{-4}$ obtained from local gravity tests. \nFor the case t
hat the effective mass of the field $\\partial_{R} f$ becomes large in the
solar-system scale\, the effect of the gravity modification would be supp
ressed due to the chameleon mechanism\, and the observational constraint c
ould be satisfied. \nAn explicit formula for the parameter $\\gamma$\, how
ever\, has not been obtained for that case. \n\nIn our approach\, we emplo
y a cosmological post-Newtonian approximation\, and carefully make an orde
r-of-magnitude estimate of each term in the field equations for the deriva
tion. \nThis approximation enables us to treat local-scale high-density re
gions\, in which the chameleon mechanism would take place. \nOur results u
pdate the previously known ones and provide more stringent constraints fro
m local gravity tests than before.\n\nhttps://indico.cern.ch/event/462870/
contributions/2255324/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2255324/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmological implications of quantum entanglement in the multivers
e
DTSTART;VALUE=DATE-TIME:20160913T120000Z
DTEND;VALUE=DATE-TIME:20160913T123500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252620@indico.cern.ch
DESCRIPTION:Speakers: Sugumi Kanno ()\nWe explore the cosmological implica
tions of quantum entanglement between two causally disconnected universes
in the multiverse. We first consider two causally separated de Sitter spac
es with a state which is initially entangled. We derive the reduced densit
y matrix of our universe and compute the spectrum of vacuum fluctuations.
We then consider the same system with an initially non-entangled state. We
find that scale dependent modulations may enter the spectrum for the case
of initially non-entangled state due to quantum interference. This gives
rise to the possibility that the existence of causally disconnected univer
ses may be experimentally tested by analyzing correlators in detail.\n\nht
tps://indico.cern.ch/event/462870/contributions/2252620/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252620/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entropy/information flux in Hawking radiation
DTSTART;VALUE=DATE-TIME:20160916T141000Z
DTEND;VALUE=DATE-TIME:20160916T143500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252660@indico.cern.ch
DESCRIPTION:Speakers: Ana Alonso Serrano (Institute for Fundamental Physic
s-CSIC)\nBlackbody radiation contains (on average) an entropy of 3.9+-2.5
bits per photon. This applies not only to provervial case of “burning a
lump of coal”\, but also to the Hawking radiation from black holes. The
flip side of this observation is the information budget: If the emission p
rocess is unitary\, as it certainly is for normal physical burning\, then
this entropy is exactly compensated by the “hidden information” in the
correlations. We shall now extend this argument to the Hawking radiation
from black holes\, demonstrating that the assumption of unitarity leads to
a perfectly reasonable entropy/information budget. The key technical aspe
ct of our calculation is the “average subsystem” approach\, but applie
d to a tripartite pure system consisting of the (black hole)+(Hawking radi
ation)+(rest of the universe).\n\nhttps://indico.cern.ch/event/462870/cont
ributions/2252660/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252660/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Causality in "noncommutative spacetimes"
DTSTART;VALUE=DATE-TIME:20160916T150000Z
DTEND;VALUE=DATE-TIME:20160916T152500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252671@indico.cern.ch
DESCRIPTION:Speakers: Michal Eckstein (Jagiellonian University)\nDrawing f
rom the mathematical richness of noncommutative geometry\, I will introduc
e the concept of an "almost commutative space-time" and show that it admit
s a sensible notion of causality. The latter does not affect classical cau
sal relations in the space-time component\, but it does induce highly non-
trivial constraints on the "motion" in the "inner space". I will illustrat
e the general concept on a simple model and relate the outcomes to a relat
ivistic quantum effect - the Zitterbewegung. I will conclude with a brief
outlook into the nature of the causal relation in truly noncommutative spa
cetimes expected to emerge at the frontier of quantum theory and general r
elativity.\n\nhttps://indico.cern.ch/event/462870/contributions/2252671/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252671/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Universe's memory and spontaneous coherence in loop quantum cosmol
ogy
DTSTART;VALUE=DATE-TIME:20160912T152500Z
DTEND;VALUE=DATE-TIME:20160912T155000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252673@indico.cern.ch
DESCRIPTION:Speakers: Tomasz Pawlowski (Center for Theoretical Physics\, P
olish Academy of Science)\nThe quantum bounce a priori connects several (s
emi)classical epochs of Universe evolution\, \nhowever determining if and
how well the semiclassicality is preserved in this transition \nis highly
nontrivial. We review the present state of knowledge in that regards in th
e \nisotropic sector of loop quantum cosmology. This knowledge is next ext
ended by studies\nof an isotropic universe admitting positive cosmological
constant (featuring an infinite chain of large Universe epochs). It is al
so shown\, that such universe always admits \na semiclassical epoch thanks
to spontaneous spontaneous coherence\, provided it is semiclassical in ce
rtain constant of motion playing the role of energy.\n\nhttps://indico.cer
n.ch/event/462870/contributions/2252673/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252673/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The false vacuum bubble as the creation of our universe
DTSTART;VALUE=DATE-TIME:20160916T120000Z
DTEND;VALUE=DATE-TIME:20160916T123500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2254189@indico.cern.ch
DESCRIPTION:Speakers: Lee Wonwoo (CQUeST\, Sogang University)\nWe present
the nucleation of a false vacuum bubble in curved space\, which have compa
ct geometries. The analytic computations for the radius and nucleation rat
e of a vacuum bubble are evaluated using the thin-wall approximation. We d
iscuss possible cosmological implications of our new solutions.\n\nhttps:/
/indico.cern.ch/event/462870/contributions/2254189/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2254189/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The cosmological constant problem in piecewise-linear models of qu
antum gravity
DTSTART;VALUE=DATE-TIME:20160916T123500Z
DTEND;VALUE=DATE-TIME:20160916T131000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2254188@indico.cern.ch
DESCRIPTION:Speakers: Marko Vojinovic (Institute of Physics\, University o
f Belgrade)\nWe will present a recent result [1] regarding the cosmologica
l constant problem. In the framework of the piecewise-linear approaches to
the construction of the gravitational path integral\, there are three con
tributions to the total cosmological constant (CC): the bare term\, the ma
tter vacuum fluctuations term\, and the quantum gravity term. The existenc
e of the quantum gravity term is necessary due to the requirement of the f
initeness of the gravitational path integral\, while its smallness is a no
nperturbative consequence of the semiclassical limit of the theory. As it
turns out\, one can exactly cancel the bare term with the matter vacuum fl
uctuations term\, leaving the quantum gravity term as the sole contributio
n to CC\, which is moreover automatically small. This result opens the doo
r to an alternative explanation of the observed smallness of the cosmologi
cal constant.\n\n\n[1] A. Mikovic and M. Vojinovic\, Europhys. Lett. 110\,
40008 (2015).\n\nhttps://indico.cern.ch/event/462870/contributions/225418
8/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2254188/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Are We Alone in the Universe?
DTSTART;VALUE=DATE-TIME:20160915T163000Z
DTEND;VALUE=DATE-TIME:20160915T173000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2240218@indico.cern.ch
DESCRIPTION:Speakers: Paul C. W. Davies (Arizona State University\, USA)\n
For 56 years astronomers have been sweeping the skies with radio telescope
s in the hope of stumbling across a message from an extraterrestrial civil
ization. So far\, nothing. Now the Search for Extraterrestrial Intelligenc
e (SETI) has received a huge fillip with a $100 million donation by the ph
ilanthropist Yuri Milner. However\, is the current search strategy misconc
eived? Should we abandon detecting messages in favour of a search for more
diverse signatures of non-human technology? In this talk\, which is based
on my book The Eerie Silence\, I shall outline the opportunities and chal
lenges facing the new era of SETI.\n\nhttps://indico.cern.ch/event/462870/
contributions/2240218/
LOCATION:Maritime University\, Szczerbcowa Campus Room 7
URL:https://indico.cern.ch/event/462870/contributions/2240218/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tests and problems of the standard model in Cosmology
DTSTART;VALUE=DATE-TIME:20160912T141000Z
DTEND;VALUE=DATE-TIME:20160912T144000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2277860@indico.cern.ch
DESCRIPTION:Speakers: Martín López Corredoira (Instituto de Astrofísica
de Canarias)\nMain foundations of the standard Lambda-CDM model of Cosmol
ogy are:\n1) The redshifts of the galaxies are due to the expansion of the
Universe plus the peculiar motions\;\n2) The cosmic microwave background
radiation and its anisotropies come from the high energy primordial Univer
se when matter and radiation become decoupled\;\n3) The abundance pattern
of the light elements is to be explained in terms of the primordial nucleo
synthesis\;\n4) The formation and evolution of galaxies can only be explai
ned in terms of gravitation within a inflation+dark matter+dark energy sc
enario.\nNumerous tests have been carried out on these ideas and\, althoug
h the standard model works pretty well to fit many observations\, there ar
e also many data that present some apparent caveats to be understood with
it. In this talk\, I offer a brief review of these tests and problems\, as
well as some examples of alternative models.\n\nhttps://indico.cern.ch/ev
ent/462870/contributions/2277860/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2277860/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Varying constants and the cosmological constant problem
DTSTART;VALUE=DATE-TIME:20160914T080000Z
DTEND;VALUE=DATE-TIME:20160914T090000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2240714@indico.cern.ch
DESCRIPTION:Speakers: David Marsh (University of Cambridge)\nI will discus
s how quantum mechanics makes the vacuum energy very sensitive to the valu
es of physical parameters and how this exacerbates the cosmological consta
nt problem in theories with varying 'constants'. Models of "interacting da
rk energy" in which the masses of dark matter states depend on the dark en
ergy sector provide a striking example of this: in some models the finetun
ing of the vacuum energy is exacerbated from one part in 10^50 to one part
in 10^(10^10). I will discuss how such models are too fine-tuned to be co
mpatible with an anthropic solution to the cosmological constant problem i
n the presently understood string theory landscape. Such models admit dist
inctive observational signatures that may be detected by future experiment
s\, hence providing an opportunity to observationally rule out the anthrop
ic\nlandscape solution of the cosmological constant problem in any theory
with a finite number of vacua.\n\nhttps://indico.cern.ch/event/462870/cont
ributions/2240714/
LOCATION:
URL:https://indico.cern.ch/event/462870/contributions/2240714/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-minimally coupled varying constants quantum cosmologies
DTSTART;VALUE=DATE-TIME:20160912T131000Z
DTEND;VALUE=DATE-TIME:20160912T134000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252588@indico.cern.ch
DESCRIPTION:Speakers: Adam Balcerzak ()\nWe consider gravity theory with v
arying speed of light and varying gravitational constant. Both constants a
re represented by non-minimally coupled scalar fields. We examine the cosm
ological evolution in the near curvature singularity regime. We find that
at the curvature singularity the speed of light goes to infinity while the
gravitational constant vanishes. This corresponds to the Newton's Mechani
cs limit represented by one of the vertex of the Bronshtein-Zelmanov-Okun
cube. The cosmological evolution includes both the pre-big-bang and post-b
ig-bang phases separated by the curvature singularity. We also investigate
the quantum counterpart of the considered theory and find the probability
of transition of the universe from the collapsing pre-big-bang phase to t
he expanding post-big-bang phase.\n\nhttps://indico.cern.ch/event/462870/c
ontributions/2252588/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2252588/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Classical and quantum cosmology of Born-Infeld type models
DTSTART;VALUE=DATE-TIME:20160912T131500Z
DTEND;VALUE=DATE-TIME:20160912T134000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252653@indico.cern.ch
DESCRIPTION:Speakers: Nick Kwidzinski (Universität zu Köln)\nWe discuss
the classical and quantum cosmology of a universe filled\nwith a tachyon c
ondensate and other Born-Infeld type fields. We analyse\, \nin particular\
, the cases with a constant potential and with an\ninverse square potentia
l. We apply the Wheeler-DeWitt equation of\ncanonical quantum gravity to t
hese models and show how it can be\nappropriately reformulated as a differ
ence equation.\n\nhttps://indico.cern.ch/event/462870/contributions/225265
3/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252653/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Searching for optical counterparts to gravitational wave events
– and how it might be done by wide field surveys
DTSTART;VALUE=DATE-TIME:20160912T130000Z
DTEND;VALUE=DATE-TIME:20160912T133000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252650@indico.cern.ch
DESCRIPTION:Speakers: Adam Zadrozny (National Centre for Nuclear Research\
, Poland)\nThe talk will focus on different observation strategies that mi
ght be used for wide field telescope surveys in order to find electromagne
tic (EM) counterpart to gravitational wave (GW) event\, and possible impli
cation of finding such counterpart. Information carried by GW and EM bands
are complementary. GW brings information about acceleration of the mass i
n the source when EM carries the information about the outcome of the even
t. If for example a gravitational wave would be observed jointly with shor
t GRB\, than the nature of such event might fully understood. In order to
find EM counterparts to GW events LSC-Virgo with many astronomical partner
s created EM Follow-up project. The strategies of observations for wide fi
eld telescopes that I would like to present are derived from observations
done by Pi of the Sky telescope for LSC-Virgo in 2010 (Looc-Up project) an
d 2015 - ... (EM Follow-up project).\n\nhttps://indico.cern.ch/event/46287
0/contributions/2252650/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252650/
END:VEVENT
BEGIN:VEVENT
SUMMARY:NonLinear Gravitational Waves as Dark Energy in Warped Spacetimes
DTSTART;VALUE=DATE-TIME:20160913T143500Z
DTEND;VALUE=DATE-TIME:20160913T150000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252547@indico.cern.ch
DESCRIPTION:Speakers: Reinoud Slagter (Asfyon and Univ of Amsterdam\, The
Netherlands)\nOn a warped five-dimensional Friedmann-Lema\\^{\\i}tre-Rober
tson-Walker(FLRW) spacetime\, dark energy can be induced by a U(1) scalar-
gauge field on the brane. We consider a zero effective cosmological const
ant\, i.e.\, the Randall-Sundrum(RS) fine-tuning and no bulk matter fields
. The standard model fields interact via the bulk Weyl tensor and cause br
ane fluctuations. Due to the warp factor\, disturbances don't fade away du
ring the expansion of the universe. The late-time behavior could be signif
icant deviate from the standard evolution of the universe. The effect is t
riggered by the time-dependent part of the warp factor with two branches
and the modified brane equations. The self-gravitating cosmic string build
s up a huge mass per unit length in the bulk and can induce massive Kaluza
-Klein (KK)-modes felt on the brane. From a non-linear perturbation analys
is\, i.e.\, the so called multiple-scale method\, it is found that the eff
ective Einstein equations contain a "back-reaction" term on the righthand
side caused by the projected five dimensional (5D) Weyl tensor and can ac
t as a dark energy term. The propagation equation to first order for the $
(\\varphi \,\\varphi)$ metric component is triggered by the disturbances c
oming from the bulk and is amplified by the warp factor. It turns out tha
t the wavelike first order perturbations contain $\\varphi$-dependent ter
ms\, so the approximate wave solutions are no longer axially symmetric. Th
is result could be used to explain the recently found spooky alignment of
the rotation axes of quasars over large distances.\n\nhttps://indico.cern
.ch/event/462870/contributions/2252547/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252547/
END:VEVENT
BEGIN:VEVENT
SUMMARY:From quantum regime to cosmology via forcing and 4-smoothness
DTSTART;VALUE=DATE-TIME:20160916T152500Z
DTEND;VALUE=DATE-TIME:20160916T155000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252658@indico.cern.ch
DESCRIPTION:Speakers: Jerzy Krol (University of Silesia)\nRecently we prop
osed a cosmological model based on smooth 4-manifolds admitting non-standa
rd smoothness structures. The manifolds are so-called exotic versions of $
\\mathbb{R}^4$ ($R^4$) and $S^3\\times \\mathbb{R}$. This model has been d
eveloped further and we have shown how to derive some realistic cosmologic
al parameters from these exotic smoothings in a new way. Besides\, we indi
cated the quantum origin of the smoothings. In more detail: the cosmologic
al constant is identified with the constant curvature of the embedding $R^
4\\to \\mathbb{R}^4$. The calculations are in good agreement with the obse
rved small value of the dark energy density. Furthermore\, the handle-body
structure of $R^4$ implies an exponential potential rather than a polynom
ial potential for the inflaton field again in agreement with the Planck sa
ttelite results. The important problem about a physical origin of the pres
ence of exotic smoothness in the cosmological models is also settled. In p
articular\, we found that the algebraic structure of the quantum mechanica
l lattice of projections enforces the exotic smoothness on $\\mathbb{R}^4$
. If the lattice were distributive and the corresponding observables were
commutative\, the resulting smoothness structure would be the standard $\\
mathbb{R}^4$. Additionally\, the set-theoretical forcing\, derived from th
e QM lattice and from exotic $\\mathbb{R}^4$\, explains the vanishing of t
he QFT contributions to cosmological constant.\n\nhttps://indico.cern.ch/e
vent/462870/contributions/2252658/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252658/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Impact of long-range wavelength-scale distortion on fine-structure
constant measurements.
DTSTART;VALUE=DATE-TIME:20160915T120000Z
DTEND;VALUE=DATE-TIME:20160915T122500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252567@indico.cern.ch
DESCRIPTION:Speakers: Vincent Dumont ()\nNew ideas in unification theories
suggest space-time variations of\ndimensionless physical constants may ex
ist and that they might be within\nreach of current instrumental precision
available from the world's best\nobservatories. State-of-the-art observat
ions already hint at such an\neffect. If confirmed\, fundamental revisions
in standard physics would be\nrequired.\n\nAccurate calibrations are of c
ourse crucial in searches for space-time\nvariations of dimensionless phys
ical constants using spectroscopic\nobservations from the world's best obs
ervatories. Several recent studies\nreveal wavelength distortions in optic
al echelle spectrographs. These\nare not yet understood and they have not
yet been measured using the\nactual science data used to derive constrain
ts on space-time variation\nof alpha (critical since they appear to vary w
ith time). In this work we\nstudy the impact of such distortions on measur
ements of the fine\nstructure constant\, alpha\, observed at high redshift
using\nhigh-resolution quasar spectroscopy and show that whilst long-rang
e\nwavelength-scale distortions do exist\, and hence contribute an\nadditi
onal systematic error\, these systematics (measured directly from\nthe sci
ence exposures themselves) are small and unlikely to explain the\nspatial
variations of alpha reported recently.\n\nhttps://indico.cern.ch/event/462
870/contributions/2252567/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252567/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Nonlinear Field Space Theory
DTSTART;VALUE=DATE-TIME:20160912T141000Z
DTEND;VALUE=DATE-TIME:20160912T143500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252659@indico.cern.ch
DESCRIPTION:Speakers: Jakub Mielczarek (Jagiellonian University)\nIn recen
t years the idea that not only the configuration space of particles\, i.e.
spacetime\, but also the corresponding momentum space can have a nontrivi
al geometry has attracted significant attention\, especially in the contex
t of quantum gravity. The aim of the talk is to discuss extension of this
concept to the domain of field theories\, the so-called Nonlinear Field Sp
ace Theory (NFST). After presenting the motivation and general aspects of
the approach we will focus on analysis \nof the prototype (quantum) NFST o
f a scalar field. The case of a compact field space is especially interest
ing\, which is a natural way to implement the “Principle of finiteness
” of physical theories\, which once motivated the Born-Infeld theory. Pr
edictions and possible areas of application of NFST will be discussed\, wi
th a focus on two aspects of NFST: possible role of NFST in early universe
cosmology and “predicted renormalization” of the charge and speed of
propagation of field excitations.\n\nhttps://indico.cern.ch/event/462870/
contributions/2252659/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252659/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Different laws of nature in strong gravitational fields? Study dep
endence of fine-structure constant on gravitational potential by using whi
te-dwarf spectra
DTSTART;VALUE=DATE-TIME:20160915T141000Z
DTEND;VALUE=DATE-TIME:20160915T143500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252569@indico.cern.ch
DESCRIPTION:Speakers: JITING HU (University of New South Wales)\nConstrain
ing variation in fundamental constants offers an important test for physic
s beyond the Standard Model. \n\nThe fine-structure constant (α) might no
t be constant throughout the universe. Models involving scalar fields coup
led to α\, the scalar charge depending on environment (e.g. on gravitatio
nal potential) naturally lead to α variation. White dwarf photospheres\,
where the gravitational potential can be ~10^5 times that on Earth\, provi
de an important testbed of such ideas.\n\nIn atoms\, different transitions
have different sensitivities (q) to α variation (Δα/α)\, which result
s in a unique pattern of line shifts.\nBy comparing with laboratory wavele
ngths\, Δα/α can be solved with Monte Carlo method.\n \nIn this project
\, we have used high resolution (R ~144\,000) FUV spectra from white dwarf
G191-B2B obtained with Hubble Space Telescope. A set of “clean”\, unb
lended FeV absorption lines from photosphere were sampled for the analysis
. To better quantify impact of uncertainties in laboratory wavelengths\, 2
new experiments have been set to re-measure FeV UV wavelengths. A set of
tests for systematics enables us to constrain uncertainties associated wit
h q calculation\, Zeeman and Stark shifts\, and long-range wavelength dist
ortion in spectrograph. Here we will present our new results and the first
comprehensive analysis of systematic errors.\n\nhttps://indico.cern.ch/ev
ent/462870/contributions/2252569/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252569/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmological perturbations in dark energy phantom models
DTSTART;VALUE=DATE-TIME:20160912T122500Z
DTEND;VALUE=DATE-TIME:20160912T125000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252666@indico.cern.ch
DESCRIPTION:Speakers: Imanol Albarran (Universidade da Beira Interior (UBI
))\nOn this talk\, we will present classical dark energy models that induc
es abrupt cosmic events in the future. These events are intrinsic to phant
om-like matter\, we will as well present the cosmological pertubations of
these models. We will also briefly comment on the quantisations of these m
odels. Mariam Bouhmadi-López will give more details on the quantum cosmol
ogy of these models.\n\nhttps://indico.cern.ch/event/462870/contributions/
2252666/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252666/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmology in genealized Proca theories and beyond
DTSTART;VALUE=DATE-TIME:20160916T123500Z
DTEND;VALUE=DATE-TIME:20160916T131000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2255322@indico.cern.ch
DESCRIPTION:Speakers: Shinji Tsujikawa (Tokyo University of Science)\nWe c
onsider a massive vector field with derivative interactions that propagate
s only the 3 desired polarizations (besides two tensor polarizations from
gravity) with second-order equations of motion in curved space-time. The c
osmological implications of such generalized Proca theories are investigat
ed for both the background and the linear perturbation by taking into acco
unt the Lagrangian up to quintic order. In the presence of a matter fluid
with a temporal component of the vector field\, we derive the background e
quations of motion and show the existence of de Sitter solutions relevant
to the late-time cosmic acceleration. We also obtain conditions for the ab
sence of ghosts and Laplacian instabilities of tensor\, vector\, and scala
r perturbations in the small-scale limit. Our results are applied to concr
ete examples of the general functions in the theory\, which encompass vect
or Galileons as a specific case. In such examples\, we show that the de Si
tter fixed point is always a stable attractor and study viable parameter s
paces in which the no-ghost and stability conditions are satisfied during
the cosmic expansion history.\n\nWe also construct higher-order derivative
interactions beyond second-order generalized Proca theories that propagat
e only the three desired polarizations of a massive vector field besides
the two tensor polarizations from gravity.\n\nhttps://indico.cern.ch/event
/462870/contributions/2255322/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2255322/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Searching for variations of fundamental constants and dark matter
using an atomic clock ensemble
DTSTART;VALUE=DATE-TIME:20160913T120000Z
DTEND;VALUE=DATE-TIME:20160913T123000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252574@indico.cern.ch
DESCRIPTION:Speakers: Jocelyne Guéna (Observatoire de Paris)\nThe ratio o
f two atomic transition frequencies is by definition independent of the un
it of frequency and therefore its value depends only on fundamental consta
nts such as the fine-structure constant $\\alpha$ or fundamental propertie
s of particles like for instance the electron mass. Repeated measurements
of frequency ratios performed in the laboratory\, with suitable atomic str
ucture calculations\, are therefore a direct test of the present-day stabi
lity of fundamental constants with respect to space-time and\, via the mot
ion of the Earth\, gravitational potential. Such tests are independent fro
m any cosmological models and complementary to astrophysical tests.\n \nAt
LNE-SYRTE we operate an ensemble of atomic clocks both in the microwave (
hyperfine transition in the ground state of $^{133}$Cs and $^{87}$Rb) and
in the optical part of the spectrum (1S$_{0}$ - 3P$_{0}$ in $^{87}$Sr and
$^{199}$Hg) providing for several atomic frequency comparisons [1]. In thi
s talk we will report more specifically on highly accurate Rb/Cs hyperfine
frequency comparisons performed with atomic fountains over more than 15 y
r. They provide stringent limits on possible time variations of a particul
ar linear combination of constants\, or its coupling to gravity\, involvin
g $\\alpha$ and the quark mass scaled to the chromodynamics mass scale [2]
. The results also constitute a stringent differential redshift test for t
he Rb/Cs couple. Besides\, they provide improved constraints on the coupli
ng of a putative massive scalar dark matter field to standard matter [3].
We will also present repeated accurate measurements of the Sr/Cs and Hg/Cs
frequency ratios which complement similar measurements performed in othe
r laboratories\, and for the first time\, measurements of Sr/Rb and Hg/Rb
frequency ratios which are sensitive to other linear combinations of const
ants [4][5].\n \n \n\n[1] M. Abgrall *et al.*\, C.R. Physique 16\,
461-470 (2015)\n\n[2] J. Guéna *et al.*\, Phys. Rev. Lett. 109\, 080801
(2012)\n \n[3] A. Hees et *al.*\, submitted\, available at arXiv:1604.0851
4 (2016)\n\n[4] Le Targat et al.\, submitted\, available at arXiv:1605.038
78 (2016)\n \n[5] R. Tyumenev et al.\, submitted\, available at arXiv:1603
.02026 (2016)\n\nhttps://indico.cern.ch/event/462870/contributions/2252574
/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2252574/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Search for New Physics with Atomic Clocks
DTSTART;VALUE=DATE-TIME:20160912T093000Z
DTEND;VALUE=DATE-TIME:20160912T103000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252583@indico.cern.ch
DESCRIPTION:Speakers: Ekkehard Peik (PTB)\nThe precision of atomic clocks
improves at a rapid pace: While caesium clocks now reach relative uncerta
inties of a few $10^{-16}$\, several optical clocks based on different ato
ms and ions are now reported with systematic uncertainties in the low $10^
{-18}$ range [1]. The Yb$^+$ optical clock at PTB has recently reached t
his uncertainty [2]\, following Hans Dehmelt’s seminal ideas of using
a single trapped ion\, laser cooling and the observation of quantum jumps
as a spectroscopic signal\, but based on an unusual reference transition (
S-F electric octupole) and special Ramsey interrogation schemes that suppr
ess systematic frequency shifts. The availability of highly precise clock
s relying on different quantum systems allows for improved tests of fundam
ental physics\, especially quantitative tests of relativity and searches f
or violations of the equivalence principle. The strong relativistic contri
butions to the transition energy and the high electronic angular momentum
of the F-state make the Yb$^+$ optical clock an especially sensitive test
case. In comparisons with a $^{87}$Sr optical lattice clock at PTB [3] we
have performed improved tests for temporal variations of the fine structur
e constant and the proton-to-electron mass ratio\, of coupling of $\\alpha
$ to gravity in the Solar potential and of violation of Lorentz invariance
in the electron sector. \n\n[1] A. D. Ludlow\, M. M. Boyd\, J. Ye\, E. Pe
ik\, P. O. Schmidt\, Rev. Mod. Phys. 87\, 637 (2015)\n\n[2] N. Huntemann\,
C. Sanner\, B. Lipphardt\, Chr. Tamm\, E. Peik\, Phys. Rev. Lett. 116\, 0
63001 (2016)\n\n[3] C. Grebing\, A. Al-Masoudi\, S. Dörscher\, S. Häfner
\, V. Gerginov\,\nS. Weyers\, B. Lipphardt\, F. Riehle\, U. Sterr\, C. Lis
dat\, Optica 3\, 563 (2016)\n\nhttps://indico.cern.ch/event/462870/contrib
utions/2252583/
LOCATION:Maritime University of Szczecin Campus\, Szczerbcowa 4 Room 7
URL:https://indico.cern.ch/event/462870/contributions/2252583/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tabletop experiments using atomic dysprosium and ytterbium for tes
ts of fundamental physics.
DTSTART;VALUE=DATE-TIME:20160913T123000Z
DTEND;VALUE=DATE-TIME:20160913T130000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252604@indico.cern.ch
DESCRIPTION:Speakers: Lykourgos Bougas (Johannes Gutenberg Universität)\n
Atomic dysprosium (Dy) and ytterbium (Yb) have proved to be valuable syste
ms to study fundamental problems in modern physics. Their high atomic mass
and their rich energy-level structure\, which results in accidental degen
eracies of opposite-parity energy states\, make them ideal candidates for
investigating parity-violating (PV) interactions. Dysprosium is particular
ly well-suited for searches of time variation of fundamental constants. In
addition\, atomic PV experiments offer the opportunity to study the weak
interaction at low energy scales\, providing valuable information about th
e Standard Model and nuclear physics. Most notably\, the broad isotope dis
tribution of both systems brings within reach the possibility of measuring
neutron-skin variation among different isotopes\, as well as detecting nu
clear anapole moments.\n\nWe provide an overview of our group’s experime
ntal work on testing fundamental symmetries\, searching for variations of
fundamental constants\, and measuring PV interactions using atomic Yb and
Dy. The emphasis is on our newly revised PV experimental setups and curren
t efforts\, with a discussion of the present statistical sensitivities and
future plans. Furthermore\, we discuss two recent developments: (1) analy
sis of the Yb and Dy measurements that has been used to constrain possible
PV interactions of cosmic fields with atomic electrons\, and (2) precise
radio-frequency spectroscopy in Dy that has provided strict limits on very
-low-mass dark-matter particles.\n\nhttps://indico.cern.ch/event/462870/co
ntributions/2252604/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2252604/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Number of Tidal Dwarf Satellite Galaxies in Dependence of Bulg
e Index
DTSTART;VALUE=DATE-TIME:20160916T151000Z
DTEND;VALUE=DATE-TIME:20160916T153000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2255326@indico.cern.ch
DESCRIPTION:Speakers: Martín López Corredoira (Instituto de Astrofísica
de Canarias)\nABSTRACT: We show that a significant correlation (up to 5σ
) emerges between the bulge index\, defined to be larger for a larger bulg
e/disk ratio\, in spiral galaxies with similar luminosities in the Galaxy
Zoo 2 of the Sloan Digital Sky Survey and the number of tidal-dwarf galaxi
es in the catalog by Kaviraj et al. In the standard cold or warm dark matt
er cosmological models\, the number of satellite galaxies correlates with
the circular velocity of the dark matter host halo. In generalized gravity
models without cold or warm dark matter\, such a correlation does not exi
st\, because host galaxies cannot capture infalling dwarf galaxies due to
the absence of dark-matter-induced dynamical friction. However\, in such m
odels\, a correlation is expected to exist between the bulge mass and the
number of satellite galaxies because bulges and tidal-dwarf satellite gala
xies form in encounters between host galaxies. This is not predicted by da
rk matter models in which bulge mass and the number of satellites are a pr
iori uncorrelated because higher bulge/disk ratios do not imply higher dar
k/luminous ratios. Hence\, our correlation reproduces the prediction of sc
enarios without dark matter\, whereas an explanation is not found readily
from the a priori predictions of the standard scenario with dark matter. F
urther research is needed to explore whether some application of the stand
ard theory may explain this correlation.\n\nhttps://indico.cern.ch/event/4
62870/contributions/2255326/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2255326/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recovering a redshift-extended VSL signal from galaxy surveys
DTSTART;VALUE=DATE-TIME:20160915T150000Z
DTEND;VALUE=DATE-TIME:20160915T152500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252607@indico.cern.ch
DESCRIPTION:Speakers: Vincenzo Salzano (University of Szczecin)\nWe invest
igate a new method to recover (if any) a possible varying speed of light (
VSL) signal from cosmological data on an extended redshift range. We use m
ock cosmological data from future galaxy surveys (BOSS\, DESI\, *WFirst-2.
4* and SKA): the sound horizon at decoupling imprinted in the clustering o
f galaxies (BAO) as an angular diameter distance\, and the expansion rate
derived from those galaxies recognized as cosmic chronometers. We find tha
t\, given the forecast sensitivities of such surveys\, a $\\sim1\\%$ VSL s
ignal can be detected at $3\\sigma$ confidence level in the redshift inter
val $z \\in [0.\,1.55]$. Smaller signals $(\\sim0.1\\%)$ will be hardly de
tected \n(even if some lower possibility for a $1\\sigma$ detection is sti
ll possible). Finally\, we discuss the degeneration between a VSL signal a
nd a non-null spatial curvature: we show that\, given present bounds on cu
rvature\, any signal\, if detected\, can be attributed to a VSL signal wit
h a very high confidence. On the other hand\, our method turns out to be u
seful even in the classical scenario of a constant speed of light: in this
case\, the signal we reconstruct can be totally ascribed to spatial curva
ture and\,thus\, we might have a method to detect a $0.01$-order curvature
in the same redhift range with a very high confidence.\n\nhttps://indico.
cern.ch/event/462870/contributions/2252607/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252607/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higgs Starobinsky inflation
DTSTART;VALUE=DATE-TIME:20160915T120000Z
DTEND;VALUE=DATE-TIME:20160915T123000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252670@indico.cern.ch
DESCRIPTION:Speakers: Iberê Kuntz ()\nThe idea that inflation may be due
to degrees of freedom already present in the standard\nmodel of particle p
hysics or quantum general relativity is extremely attractive and has recei
ved much attention in the recent years. In particular two models stand out
by their\nsimplicity and elegance. Higgs inflation with a large non-minim
al coupling of the Higgs\nboson $H$ to the Ricci scalar ($\\xi H^\\dagger
HR$) and Starobinsky's inflation model based on $R^2$ gravity are both min
imalistic and perfectly compatible with the latest Planck data. The aim of
this talk is to point out an intriguing distinct possibility\, namely tha
t\nStarobinsky inflation is generated by quantum effects due to a large no
n-minimal coupling\nof the Higgs boson to the Ricci scalar. In this framew
ork we do not need to posit that the\nHiggs boson starts at a high field v
alue in the early universe which would alleviate constraints coming from t
he requirement of having a stable Higgs potential even for large Higgs fie
ld values.\n\nhttps://indico.cern.ch/event/462870/contributions/2252670/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252670/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Synthetic approach to the singularity problem
DTSTART;VALUE=DATE-TIME:20160912T120000Z
DTEND;VALUE=DATE-TIME:20160912T122500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2253934@indico.cern.ch
DESCRIPTION:Speakers: Michael Heller (Vatican Astronomical Observatory\; C
opernicus Center\, Kraków\, Poland)\nWe try to convince the reader that t
he categorical version of differential geometry\, called Synthetic Differe
ntial Geometry (SDG)\, offers valuable tools which can be applied to work
with some unsolved problems of general relativity. We do this with respect
to the space-time singularity problem. The essential difference between t
he usual differential geometry and SDG is that the latter enriches the rea
l line by introducing infinitesimal of various kinds. Owing to this geomet
ry acquires a tool to penetrate “infinitesimally small” parts of a giv
en manifold. However\, to make use of this tool we must switch from the ca
tegory of sets to some other suitable category. We try two topoi: the topo
s $\\cal{G}$ of germ determined ideals and the so-called Basel topos $\\ca
l{B}$. The category of manifolds is a subcategory of both of them. In $\\c
al{G}$\, we construct a simple model of a contracting sphere. As the spher
e shrinks\, its curvature increases\, but when the radius of the sphere re
aches infinitesimal values\, the curvature becomes infinitesimal and the s
ingularity is avoided. The topos $\\cal{B}$\, unlike the topos $\\cal {G}$
\, has invertible infinitesimal and infinitely large nonstandard natural n
umbers. This allows us to see what happens when a function “goes through
a singularity”. When changing from the category of sets to another topo
s\, one must be ready to switch from classical logic to intuitionistic log
ic. This is a radical step\, but the logic of the universe is not obliged
to conform to the logic of our brains.\n\nhttps://indico.cern.ch/event/462
870/contributions/2253934/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2253934/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Where do the laws of physics come from?
DTSTART;VALUE=DATE-TIME:20160917T083000Z
DTEND;VALUE=DATE-TIME:20160917T093000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2235216@indico.cern.ch
DESCRIPTION:Speakers: Paul C. W. Davies (Arizona State University\, USA)\n
Since the time of Newton\, the laws of physics have generally been regarde
d as absolute\, universal\, eternal and immutable. In the era of modern co
smology\, early versions of the big bang theory assumed the laws were magi
cally imprinted on the universe at the moment of its origin. Quantum cosmo
logy\, however\, requires the laws to transcend the physical universe\, wh
ile eternal inflation cosmology appeals to immutable meta-laws in a multiv
erse. Some cosmological theories renounce the notion of fixed laws altoget
her. Thus the status of the laws remains unclear and offers plenty of scop
e for misunderstanding and confusion. As a result\, most physicists and co
smologists shrug aside the question of the source of the laws as lying out
side the scope of science. I shall argue that the nature and origin of phy
sical laws is a proper subject for scientific scrutiny and should not be s
ummarily dismissed.\n\nhttps://indico.cern.ch/event/462870/contributions/2
235216/
LOCATION:Maritime University of Szczecin Campus\, Szczerbcowa 4 Room 7
URL:https://indico.cern.ch/event/462870/contributions/2235216/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Measuring α-variation using highly-charged ions: clocks\, calcula
tions and astrophysics
DTSTART;VALUE=DATE-TIME:20160913T093000Z
DTEND;VALUE=DATE-TIME:20160913T103000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2240702@indico.cern.ch
DESCRIPTION:Speakers: Julian Berengut (University of New South Wales\, Aus
tralia)\nSeveral recent proposals to measure α-variation use highly-charg
ed ions\, in which the effects of a possible variation are enhanced [1]. T
hese systems include potential new clocks that are predicted to have extra
ordinarily high accuracy [1-4]. In systems where the transitions are avail
able due to level crossings\, the clocks can have extremely high sensitivi
ty to variation of the fine-structure constant α\, potentially improving
current limits on time-variation of α by up to two orders-of-magnitude.\n
\nThe experimental spectroscopy of one such candidate\, the Ir17+ ion whic
h has two holes in the otherwise closed 4f14 5s2 valence shells\, has show
n that current theoretical methods have severe limitations in accurately d
escribing the spectrum [5]. That study included (along with the experiment
al spectrum) the results of several calculations including different varia
nts of configuration interaction (CI)\, multiconfigurational Dirac-Fock\,
and Fock-space coupled cluster. None of the theories tested were able to u
nambiguously identify the entire observed spectrum. Furthermore many exist
ing methods of calculation – such as the combined configuration interact
ion and many-body perturbation theory (CI+MBPT)\, correlation potential me
thods\, and coupled-cluster methods – are designed to work well in one o
r two-valence-electron atoms and particularly in near-neutral systems.\n\n
We have developed an ab initio method of calculating atomic spectra and pr
operties in complicated systems\, such as HCIs and particularly where elec
tron-holes play an important role. Based on the CI+MBPT method [6]\, we ha
ve implemented Wick contractions numerically in AMBiT allowing the inclusi
on of configurations with arbitrary numbers of valence holes and electrons
. As a first test case\, we have performed calculations of spectra and sen
sitivity to α-variation for the Hg+ ion\, where the clock transition 6s t
o 5d−1 6s2 has been compared with an Al+ clock to get the best current l
imit on time-variation of α [7]. We present results of the full CI+MBPT m
ethod with holes\, and updated limits on time-variation of α based on the
existing experiment [8].\n\nThe enhanced sensitivity to α-variation of h
ighly-charged ions is also exploited in astrophysical measurements of meta
l lines in the spectra of white-dwarf stars [9]. These are used to probe t
he dependence of α on a strong gravitational field. While the FeV and NiV
ions used in this study are less highly-charged\, many of the limitations
in the accuracy of calculations are common to the clock HCIs.\n\nReferenc
es\n[1] J. C. Berengut\, V. A. Dzuba\, and V. V. Flambaum\, Enhanced labor
atory sensitivity to variation of the fine-structure constant using highly
charged ions\, Phys. Rev. Lett. 105\, 120801 (2010).\n[2] J. C. Berengut\
, V. A. Dzuba\, V. V. Flambaum\, and A. Ong\, Hole Transitions in Multiply
-Charged Ions for Precision Laser Spectroscopy and Searching for α-variat
ion\, Phys. Rev. Lett. 106\, 210802 (2011).\n[3] A. Derevianko\, V. A. Dzu
ba\, and V. V. Flambaum\, Highly-Charged Ions as a Basis of Optical Atomic
Clockwork of Exceptional Accuracy\, Phys. Rev. Lett. 109\, 180801 (2012).
\n[4] J. C. Berengut\, V. A. Dzuba\, V. V. Flambaum\, and A. Ong\, Optical
transitions in highly-charged californium ions with high sensitivity to v
ariation of the fine-structure constant\, Phys. Rev. Lett. 109\, 070802 (2
012).\n[5] A. Windberger et al.\, Identification of the Predicted 5s–4 f
Level Crossing Optical Lines with Applications ?to Metrology and Searches
for the Variation of Fundamental Constants\, Phys. Rev. Lett. 114\, 15080
1 (2015).\n[6] V. A. Dzuba\, V. V. Flambaum and M. G. Kozlov\, Combination
of the Many-body Perturbation Theory with the Configuration-Interaction M
ethod\, Phys. Rev. A 54\, 3948 (1996)\n[7] T. Rosenband et al.\, Frequency
Ratio of Al+ and Hg+ Single-Ion Optical Clocks\; Metrology at the 17th De
cimal Place\, Science 319\, 1808 (2008).\n[8] J. C. Berengut\, Particle-ho
le configuration interaction and many-body perturbation theory: Applicatio
n to Hg+\, Phys. Rev. A\, 94\, 012502 (2016).\n[9] J. C. Berengut\, V. V.
Flambaum\, A. Ong\, J. K. Webb\, J. D. Barrow\, M. A. Barstow\, S. P. Prev
al\, and J. B. Holberg\, Limits on the Dependence of the Fine-Structure Co
nstant on Gravitational Potential from White-Dwarf Spectra\, Phys. Rev. Le
tt. 111\, 010801 (2013).\n\nhttps://indico.cern.ch/event/462870/contributi
ons/2240702/
LOCATION:Maritime University of Szczecin Campus\, Szczerbcowa 4 Room 7
URL:https://indico.cern.ch/event/462870/contributions/2240702/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phenomenology of MTMG
DTSTART;VALUE=DATE-TIME:20160913T120000Z
DTEND;VALUE=DATE-TIME:20160913T123500Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252571@indico.cern.ch
DESCRIPTION:Speakers: Antonio De Felice (Yukawa Institute for Theoretical
Physics)\nI will briefly introduce MTMG\, and discuss its phenomenology fo
r both the self-accelerating and normal branch.\n\nhttps://indico.cern.ch/
event/462870/contributions/2252571/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252571/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effective gravitational couplings for cosmological perturbations i
n generalized Proca theories
DTSTART;VALUE=DATE-TIME:20160913T123500Z
DTEND;VALUE=DATE-TIME:20160913T131000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252562@indico.cern.ch
DESCRIPTION:Speakers: Ryotaro Kase (Tokyo University of Science)\nWe consi
der the finite interactions of the generalized Proca theory \nincluding th
e sixth-order Lagrangian and derive the full linear perturbation \nequatio
ns of motion on the flat Friedmann-Lema\\^{i}tre-Robertson-Walker backgrou
nd\nin the presence of a matter perfect fluid.\nBy construction\, the prop
agating degrees of freedom (besides the matter perfect fluid) \nare two tr
ansverse vector perturbations\, one longitudinal scalar\,\nand two tensor
polarizations. \nThe Lagrangians associated with intrinsic\nvector modes n
either affect the background equations of motion\nnor the second-order act
ion of tensor perturbations\, but they do give\nrise to non-trivial modifi
cations to the no-ghost condition of vector perturbations\nand to the prop
agation speeds of vector and scalar perturbations.\nWe derive the effectiv
e gravitational coupling $G_{\\rm eff}$ with\nmatter density perturbations
under a quasi-static approximation\non scales deep inside the sound horiz
on.\nWe find that the existence of intrinsic vector modes allows\na possib
ility for reducing $G_{\\rm eff}$. In fact\, within the parameter space\,
$G_{\\rm eff}$\ncan be even smaller than the Newton gravitational constant
$G$\nat the late cosmological epoch\, with a peculiar phantom dark energy
\nequation of state (without ghosts). The modifications to the slip parame
ter $\\eta$\nand the evolution of growth rate $f\\sigma_8$ are discussed a
s well.\nThus\, dark energy models in the framework of generalized Proca t
heories\ncan be observationally distinguished from the $\\Lambda$CDM model
\naccording to both cosmic growth and expansion history. Furthermore\,\nwe
study the evolution of vector perturbations and show that outside\nthe ve
ctor sound horizon the perturbations are nearly frozen and start to\ndecay
with oscillations after the horizon entry.\n\nhttps://indico.cern.ch/even
t/462870/contributions/2252562/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252562/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Varying constants quantum cosmology
DTSTART;VALUE=DATE-TIME:20160912T151000Z
DTEND;VALUE=DATE-TIME:20160912T154000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2289115@indico.cern.ch
DESCRIPTION:Speakers: Katarzyna Leszczyńska (University of Szczecin)\nIn
the talk I will focus on quantum cosmology minisuperspace models based on
the Wheeler–DeWitt equation which apart from standard matter and 3-geome
try configuration degrees of freedom allow those related to the variabilit
y of physical constants – varying speed of light (VSL) c and varying gra
vitational constant G. The probability of tunneling of the universe “fro
m nothing” to the Friedmann phase will be discussed and its dependence o
n these extra degrees of freedom and on the matter content.\n\nhttps://ind
ico.cern.ch/event/462870/contributions/2289115/
LOCATION:Room 7
URL:https://indico.cern.ch/event/462870/contributions/2289115/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thawing model seems to be preferable for dark energy potential in
the quintessence scenario
DTSTART;VALUE=DATE-TIME:20160913T131000Z
DTEND;VALUE=DATE-TIME:20160913T134000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252581@indico.cern.ch
DESCRIPTION:Speakers: Hara Tetsuya (Kyoto Sangyo University)\nThe time var
iation of the equation of state $w$ for quintessence scenario with a scala
r field as dark energy is studied up to the third derivative ($d^3w/da^3$)
with respect to the scale factor $a$\, in order to predict the future obs
ervations and specify the scalar potential parameters. The third derivativ
e of $w$ for general potential $V$ is derived and applied to several types
of potentials.\nThey are the inverse power-law ($V=M^{4+\\alpha}/Q^{\\alp
ha}$)\, the exponential ($V=M^4 \\exp(\\beta M/Q)$)\, the cosine $(V=M^4(\
\cos (Q/f)+1))$ and the Gaussian types ($V=M^4 \\exp(-Q ^2/\\sigma^2)$)\,
which are prototypical potentials for the freezing and thawing models. \nI
f the parameter number for a potential form is $n$\, it is necessary to fi
nd at least for $n+2$ independent observations to \nidentify the potential
form and the evolution of the scalar field ($Q$ and $\\dot{Q}$). Such obs
ervations would be the values of $\\Omega_Q\, w\, dw/da\, \\cdots $\, and
$dw^n/da^n$. Since four of the above mentioned potentials have two paramet
ers\, it is necessary to calculate the third derivative of $w$ for them to
estimate the predict values. \nIf they are tested in observation\, it w
ill be understood whether the dark energy could be described by the scalar
field with this potential. \nNumerical analysis for $d^3w/da^3$ are made
under some specified parameters in the investigated potentials. \nIt bec
omes possible to distinguish the freezing and thawing modes by the accurat
e observing $dw/da$ and $d^2w/da^2$ in some parameters.\n( arXiv:1605.0218
0 )\n\nhttps://indico.cern.ch/event/462870/contributions/2252581/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252581/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark energy constraints from ESPRESSO tests of the stability of fu
ndamental couplings
DTSTART;VALUE=DATE-TIME:20160915T131500Z
DTEND;VALUE=DATE-TIME:20160915T134000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252570@indico.cern.ch
DESCRIPTION:Speakers: Ana Catarina Leite (Instituto de Astrofísica e Ciê
ncias do Espaço)\nESPRESSO is a high-resolution-ultra-stable spectrograph
for the VLT\, whose commissioning will start in early 2017. One of its ke
y science goals is to test the stability of nature’s fundamental couplin
gs with unprecedented accuracy and control of possible\nsystematics. A tot
al of 27 nights of the ESPRESSO Consortium’s guaranteed time observation
s (GTO) will be spent in testing the stability of the fine-structure const
ant and other fundamental couplings. A set of 14 priority optimal targets
have been selected for\nthe GTO period. In this talk I will discuss the cr
iteria underlying this selection\, describe the selected targets\, and pre
sent detailed forecasts\nof the impact of these measurements on fundamenta
l physics and cosmology\, focusing on dark energy constraints and using fu
ture supernova type Ia surveys as a comparison point.\n\nhttps://indico.ce
rn.ch/event/462870/contributions/2252570/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252570/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleosynthesis predictions and high-precision deuterium measureme
nts
DTSTART;VALUE=DATE-TIME:20160912T120000Z
DTEND;VALUE=DATE-TIME:20160912T123000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252645@indico.cern.ch
DESCRIPTION:Speakers: Signe Riemer-Sorensen (University of Oslo)\nI will p
resent two new high-precision measurements of the deuterium abundance from
absorbers along the line of sight to the quasar PKS1937–1009. The absor
bers have lower column densities (N(HI)$ \\approx 18\\mathrm{cm}^{-2}$) th
an for previous high-precision measurements\, boding well for further exte
nsions of the sample due to the plenitude of low column density absorbers.
The total high-precision sample now consists of 12 measurements with a we
ighted average D/H = $2.55 \\pm 0.03 \\times 10^{-5}$. The sample does not
favour a dipole similar to the one detected for the fine structure consta
nt. The increased precision also calls for improved nucleosynthesis predic
tions. For that I present an updated version of the public AlterBBN code i
ncluding new reactions\, updated rates\, and the possibility of adding new
physics such as dark matter. The standard Big Bang Nucleosynthesis predic
tion of D/H = $2.456\\pm0.057 \\times 10^{−5}$ is consistent with the ob
served value within 1.7 standard deviations.\n\nhttps://indico.cern.ch/eve
nt/462870/contributions/2252645/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252645/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Analysing a forecast cosmological redshift drift
DTSTART;VALUE=DATE-TIME:20160912T123000Z
DTEND;VALUE=DATE-TIME:20160912T130000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252646@indico.cern.ch
DESCRIPTION:Speakers: Iker Leanizbarrutia Alonso (Universiy of the Basque
Country EHU/UPV)\nWe create a model independent mock dataset to test the v
iability and possible properties of the cosmological redshift drift\, also
known as Sandage-Loeb test. The redshift of a given object will exhibit a
specific variation through time due to the expansion of the universe. Thi
s mechanism was predicted by Sandage in 1962\, but with the technology of
that epoch it was impossible to detected the signal. When new spectroscopi
c techniques were being used in astrophysics\, the concept was revisited b
y Loeb in 1998. \n\nWe also create\, in the same model independent way as
the SL data\, future mock datasets of SN and BAO to compare with SL\, and
also to see its performance when using all datasets. The behaviour of the
datasets are analysed through testing several cosmological models with MCM
C. SL dataset presents interesting features\, as for example different cor
relations between parameters comparing to other mock datasets. Besides\, t
he ability of the SL mock dataset to constrain the matter content of the u
niverse $\\Omega_m$ is also remarkable\, being quite better than the other
datasets.\n\nhttps://indico.cern.ch/event/462870/contributions/2252646/
LOCATION:Room 5
URL:https://indico.cern.ch/event/462870/contributions/2252646/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complete Hamiltonian analysis of cosmological perturbations at all
orders
DTSTART;VALUE=DATE-TIME:20160915T141000Z
DTEND;VALUE=DATE-TIME:20160915T144000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252649@indico.cern.ch
DESCRIPTION:Speakers: Debottam Nandi ()\nThe work is based on two followin
g papers:\n\n1. D. Nandi and S. Shankaranarayanan\, Complete Hamiltonian a
nalysis of cosmological perturbations at all orders\, JCAP 1606 (2016)\, n
o. 06 038\, [arXiv:1512.02539].\n2. D. Nandi and S. Shankaranarayanan\, Co
mplete Hamiltonian analysis of cosmological perturbations at all orders II
: Non-canonical scalar field\, submitted in JCAP\, [arXiv:1606.05747].\n\n
https://indico.cern.ch/event/462870/contributions/2252649/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252649/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Running of the Running and Entropy Perturbations During Inflation
DTSTART;VALUE=DATE-TIME:20160915T130000Z
DTEND;VALUE=DATE-TIME:20160915T133000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252644@indico.cern.ch
DESCRIPTION:Speakers: Chris Longden (University of Sheffield)\nIn single f
ield slow-roll inflation\, one expects that the spectral index $n_s -1$ is
first order in slow-roll parameters. Similarly\, its running $\\alpha_s =
\\mathrm d n_s/\\mathrm d \\log k$ and the running of the running $\\beta
_s = \\mathrm d \\alpha_s/\\mathrm d \\log k$ are second and third order a
nd therefore expected to be progressively smaller\, and usually negative.
Recent analyses hinting that $\\beta_s$ may actually be positive\, and lar
ger than $\\alpha_s$ are hence beginning to generate some tension with the
simplest models of inflation. We take the first theoretical steps towards
addressing the question\, then\, of what kind of inflationary models coul
d explain such a hint\, were it to be confirmed by future experiments\, fo
cusing on two-field models of inflation in which the late-time transfer of
power from isocurvature to curvature modes allows for a much more diverse
range of phenomenology. We calculate the runnings due to this effect and
briefly apply our results to assess the feasibility of finding $|\\beta_s|
> |\\alpha_s|$ in some specific models.\n\nhttps://indico.cern.ch/event/4
62870/contributions/2252644/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252644/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Running of the Higgs quartic coupling\, gravity and the stability
of the Higgs effective potential
DTSTART;VALUE=DATE-TIME:20160915T123000Z
DTEND;VALUE=DATE-TIME:20160915T130000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252642@indico.cern.ch
DESCRIPTION:Speakers: Lukasz Nakonieczny (University of Warsaw)\nMotivated
by the cosmological setup\, we investigated the influence of the gravity
induced terms on the Higgs field effective action. Using the heat kernel a
pproach we obtained the one-loop effective action in the classical curved
spacetime. Specializing to the standard cosmological metric\, we studied t
he effect of gravitational field of this form on the behavior of the Higgs
effective potential in the high energy (around the putative instability s
cale) and the low energy (around the electrovacuum minimum) regimes. We fo
und that the lowest order nontrivial gravity induced terms\, which are pro
portional to the square of the Riemman and Ricci tensors\, may have an imp
act on the structure of the electroweak minimum and the effective running
of the Higgs quartic coupling.\n\nhttps://indico.cern.ch/event/462870/cont
ributions/2252642/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252642/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmological Isotropization from Symmetry Point of View
DTSTART;VALUE=DATE-TIME:20160915T151000Z
DTEND;VALUE=DATE-TIME:20160915T154000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252643@indico.cern.ch
DESCRIPTION:Speakers: Sajid Ali ()\nBianchi models can be used to address
the isotropization problem during the cosmological expansion of a homogene
ous universe at an earlier epoch of its evolution. As there is a large fam
ily of such models\, therefore it is necessary to characterize them on the
basis of their geometrical and dynamical properties which we accomplish u
sing Noether point symmetries of the geodetic Lagrangian in these spacetim
es. The existence of such symmetries not only helps us to specify a model
but also provide us first integrals which can be used to comprehend the dy
namics significantly. We then investigate the positive energy condition in
all specified models which provides us critical bounds on the physical pa
rameters. Lastly\, the possibilities of involving physical fields (perfect
fluid\, dust or vacuum) for a consistent viable cosmological model and it
s evolution at different stages\, is discussed.\n\nhttps://indico.cern.ch/
event/462870/contributions/2252643/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252643/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Less-simplified models of dark matter for direct detection and the
LHC
DTSTART;VALUE=DATE-TIME:20160915T144000Z
DTEND;VALUE=DATE-TIME:20160915T151000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252647@indico.cern.ch
DESCRIPTION:Speakers: Arghya Choudhury (University of Sheffield)\nWe const
ruct models of dark matter with suppressed spin-independent scattering cro
ss section utilizing the existing simplified model framework. Even simple
combinations of simplified models can exhibit interference effects that ca
use the tree level contribution to the scattering cross section to vanish\
, thus demonstrating that direct detection limits on simplified models are
not robust when embedded in a more complicated and realistic framework. I
n general for fermionic WIMP masses > 10 GeV direct detection limits on th
e spin-independent scattering cross section are much stronger than those c
oming from the LHC. However these model combinations\, which we call less-
simplified models\, represent situations where LHC searches become more co
mpetitive than direct detection experiments even for moderate dark matter
mass. We show that a complementary use of several searches at the LHC can
strongly constrain the direct detection blind spots by setting limits on t
he coupling constants and mediators' mass. We derive the strongest limits
for combinations of vector + scalar\, vector + "squark"\, and "squark" + s
calar mediator\, and present the corresponding projections for the LHC 14
TeV for a number of searches: mono-jet\, jets + missing energy\, and searc
hes for heavy vector resonances.\n\nhttps://indico.cern.ch/event/462870/co
ntributions/2252647/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252647/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Plato and Modern Physics
DTSTART;VALUE=DATE-TIME:20160917T073000Z
DTEND;VALUE=DATE-TIME:20160917T083000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2235222@indico.cern.ch
DESCRIPTION:Speakers: Krzysztof Meissner (Institute of Theoretical Physics
\, University of Warsaw)\nThe talk is devoted to the discussion why modern
fundamental physics is closer to the objective idealism of Plato than to
the Aristotelian empiricism\, after more than 2 thousand years of the domi
nation of the latter in classical physics.\n\nhttps://indico.cern.ch/event
/462870/contributions/2235222/
LOCATION:Maritime University of Szczecin Campus\, Szczerbcowa 4 Room 7
URL:https://indico.cern.ch/event/462870/contributions/2235222/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bell violation in the Sky [talk via Skype]
DTSTART;VALUE=DATE-TIME:20160913T145500Z
DTEND;VALUE=DATE-TIME:20160913T153000Z
DTSTAMP;VALUE=DATE-TIME:20200218T195457Z
UID:indico-contribution-462870-2252622@indico.cern.ch
DESCRIPTION:Speakers: Sayantan Choudhury (Department of Theoretical Physic
s\, Tata Institute of Fundamental Research\, Mumbai)\nIn the present artic
le\, we have addressed the following points:\n\n Firstly we have briefly r
eviewed Bell's inequality in quantum mechanics and its implications. For t
his we reviewed the proof of Bell's inequality.\nFurther we have discussed
the violation of Bell's inequality in the context of quantum mechanics. A
lso we have given the explanation for such violation\, which finally give
rise to new physical concepts and phenomena.\n\n Next we have briefly disc
ussed about the setup for Bell's inequality violating test experiment in t
he context of primordial cosmology. Further we have studied creation of ne
w massive particles as introduced in the context of inflationary paradigm
for various choice of time dependent mass profile. To describe a very smal
l fraction of particle creation after inflation we have computed the expre
ssion for Bogoliubov coefficient $\\beta$ in FLRW space-time\, which chara
cterizes the amount of mixing between the two types of WKB solutions. Next
using the results for Bogoliubov co-efficients we have further calculated
reflection and transmission co-efficients\, number density and energy den
sity of the created particles for various mass profiles. Here we have prov
ided the results for three specific cases:-super horizon\, horizon crossin
g\, sub horizon.Further we have studied cosmological scalar curvature fluc
tuations in presence of new massive particles for arbitrary choice of init
ial condition and also for any arbitrary mass profile. Here we have explic
itly derived the expression for one point and two point correlation functi
on using in-in formalism. Here in our computation we have introduced a ne
w cosmological observable which captures the effect of Bell's inequality v
iolation in cosmology. Further we have expressed the scale of inflation in
terms of the amount of Bell's inequality violation in cosmology experimen
tal setup using model independent prescription like EFT. Additionally we h
ave derived a model independent expression for first Hubble slow roll para
meter $\\epsilon=-\\dot{H}/H^2$ and tensor-to-scalar ratio in terms of the
Bell's inequality violating observable within the framework of EFT. Addit
ionally\, we have given an estimate of heavy field mass parameter m/H\nto
violate Bell's inequality within cosmological setup.\n\n It is important
to note that when all the EFT interactions are absent in that case effecti
ve sound speed $c_{S}\\sim 1$ and one can get back the results for canonic
al slow-roll models.\nOn the other hand when the EFT interactions are swit
ched on within the present description\, one can able to accommodate the n
on-canonical as well \n as non-minimal interactions within this framework.
In that case both $c_{S}$ and $\\tilde{c}_{S}$ are less than\n unity and
in such a situation one can always constraint the sound speed parameter as
well the strength \n of the EFT interactions using observational probes (
Planck 2015 data).\n One can easily compare the present setup with effecti
ve time varying mass \n parameter with the axions with time varying decay
constant.\n For $m2 in horizon crossing\, super horizon\n and sub horizon
regime.\n\nhttps://indico.cern.ch/event/462870/contributions/2252622/
LOCATION:Room 6
URL:https://indico.cern.ch/event/462870/contributions/2252622/
END:VEVENT
END:VCALENDAR