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BEGIN:VEVENT
SUMMARY:The Big Silence
DTSTART;VALUE=DATE-TIME:20170926T171000Z
DTEND;VALUE=DATE-TIME:20170926T173000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2630470@indico.cern.ch
DESCRIPTION:Speakers: Jakub Mielczarek (Jagiellonian University)\nThe so-c
alled state of silence has been obtained as a possible \nconsequence of de
formed space-time structure in the models \nof loop quantum gravity. The
purpose of the talk is to provide \nup to date status of the state of sile
nce in cosmology. Our attention \nwill be focused on discussing possibilit
y of solving various \ncosmological problems employing the state of silenc
e. In particular\, \nthe initial value problem including the issue of init
ial homogeneity \nwill be discussed. Generation of cosmological perturbati
ons \nand the possibile non-Gaussian contributions will be analyzed.\nFurt
hermore\, our current fundamental understanding of the state \nof silence
and the associated change of signature will be presented.\n\nhttps://indic
o.cern.ch/event/588228/contributions/2630470/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2630470/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Supersymmetric Near-Horizon Geometries
DTSTART;VALUE=DATE-TIME:20170927T100500Z
DTEND;VALUE=DATE-TIME:20170927T102500Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641196@indico.cern.ch
DESCRIPTION:Speakers: Andrea Fontanella (University of Surrey)\nThe horizo
n conjecture\, proved in a case by case basis\, states that every supersym
metric smooth horizon admits an $sl(2\, \\mathbb{R})$ symmetry algebra. Ho
wever it is unclear how string corrections modify the statement. In this t
alk I will present the analysis of supersymmetric near-horizon geometries
in heterotic supergravity up to two loop order in sigma model perturbation
theory\, and show the conditions for the horizon to admit an $sl(2\, \\ma
thbb{R})$ symmetry algebra. In the second part of the talk\, I shall prese
nt a step further on answering the question how many extreme black holes p
osses a prescribed near-horizon geometry.\n\nhttps://indico.cern.ch/event/
588228/contributions/2641196/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641196/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Einstein-Weyl spaces and near horizon geometry
DTSTART;VALUE=DATE-TIME:20170926T141000Z
DTEND;VALUE=DATE-TIME:20170926T143000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2629741@indico.cern.ch
DESCRIPTION:Speakers: Maciej Dunajski (DAMTP Cambridge)\nAbstract\n\nhttps
://indico.cern.ch/event/588228/contributions/2629741/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2629741/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark Matter Decay According to CCC: Detectable Gravitational Signa
ls?
DTSTART;VALUE=DATE-TIME:20170926T183000Z
DTEND;VALUE=DATE-TIME:20170926T191500Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2732762@indico.cern.ch
DESCRIPTION:Speakers: Roger Penrose (University of Oxford)\nIn the cosmolo
gical scheme of conformal cyclic cosmology (CCC)\, the equations governing
the crossover form each aeon to the next demand the creation of a dominan
t new scalar material\, postulated to be dark matter. In order that this m
aterial does not build up from aeon to aeon\, it is taken to decay away co
mpletely over the history of each aeon. The dark matter particles (erebons
) may be expected to behave almost as classical particles\, though with bo
sonic properties\, being probably of about a Planck mass\, and interacting
only gravitationally. Their decay would be to gravitational signals\, and
responsible for the (~scale invariant) temperature fluctuations in the CM
B of the succeeding aeon. In our own aeon\, erebon decay might show up in
signals discernable by gravitational wave detectors.\n\nhttps://indico.cer
n.ch/event/588228/contributions/2732762/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2732762/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a theory of nonlinear gravitational waves: a systematic ap
proach to nonlinear gravitational perturbations in vacuum
DTSTART;VALUE=DATE-TIME:20170926T104000Z
DTEND;VALUE=DATE-TIME:20170926T110000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2732846@indico.cern.ch
DESCRIPTION:Speakers: Andrzej Rostworowski ()\nI will present a systematic
and robust approach to nonlinear gravitational perturbations of vacuum sp
acetimes. In particular\, I will show that the system of perturbative Eins
tein equations reduces at each perturbation order to two (for each gravita
tional mode in $3+1$ dimensions on which our study is focused) scalar wave
equations\, and then we show how the metric perturbations can be explicit
ly obtained\, once the solutions to these scalar wave equations are known.
These results show that the concept of polarization of a gravitational wa
ve does make sense also beyond the linear approximation and provides a bas
is for a theory of nonlinear gravitational waves. The talk is based on a r
ecent preprint http://arxiv.org/abs/1705.02258.\n\nhttps://indico.cern.ch/
event/588228/contributions/2732846/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2732846/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Internal clock formulation of quantum mechanics
DTSTART;VALUE=DATE-TIME:20170927T164000Z
DTEND;VALUE=DATE-TIME:20170927T170000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2630856@indico.cern.ch
DESCRIPTION:Speakers: Przemysław Małkiewicz (National Centre for Nuclear
Research)\nThe lack of external and fixed time is encoded into the canoni
cal formalism of general relativity by means of the Hamiltonian constraint
. The lack of time does not imply the lack of evolution but rather brings
to the fore the role of internal clocks which are some largely arbitrary
internal degrees of freedom with respect to which the evolution of timele
ss systems can be described. I will take this idea seriously and try to un
derstand that what it may imply for quantum mechanics when the fixed exte
rnal time is replaced by arbitrary internal clocks.\n\nhttps://indico.cern
.ch/event/588228/contributions/2630856/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2630856/
END:VEVENT
BEGIN:VEVENT
SUMMARY:General relativity with a positive cosmological constant $\\Lambda
$ as a gauge theory
DTSTART;VALUE=DATE-TIME:20170925T161000Z
DTEND;VALUE=DATE-TIME:20170925T163000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2617543@indico.cern.ch
DESCRIPTION:Speakers: Janusz Garecki ()\nIn the paper we show that the gen
eral relativity action (and Lagrangian) in recent Einstein-Palatini formul
ation is equivalent to the action (and Langrangian) of a gauge field.\n\nW
e begin with a bit of information of the Einstein-Palatini (EP) action\, t
hen we present how Einstein fields equations can be derived from it. In th
e next section\, we consider Einstein-Palatini action integral for general
relativity with a positive cosmological constant $\\Lambda $ in terms of
''corrected curvature'' $\\hat{F}$. We will see that in terms of $\\hat{F}
$ this action takes the form typical for a gauge field. Finally\, we give
a geometrical interpretation of the curvature $\\hat{F}$.\n\nhttps://indic
o.cern.ch/event/588228/contributions/2617543/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2617543/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$\\psi$-diagrams for spherically symmetric spacetimes
DTSTART;VALUE=DATE-TIME:20170926T133500Z
DTEND;VALUE=DATE-TIME:20170926T135000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641241@indico.cern.ch
DESCRIPTION:Speakers: Bartosz Kuśmierz (Wrocław university of Science an
d Technology)\nWe propose and discuss a $\\psi$-diagram a novel kind of a
plot representing light-like geodesics. We consider spherically symmetric\
, static spacetimes. The general construction is illustrated with diagrams
for light rays in the proximity of the Schwarzschild\, Reissner–Nordstr
om (charged) and Kerr (rotating) types of black holes.\n\n\nThe idea is de
veloped from the phase portraits illustrating the null geodesics in Schwar
zschild spacetime [1]. But our proposal puts greater emphasis on the role
of observer and his/her perception of light. We consider various types of
observers including local static and freely falling. The construction for
freely falling one is of particular interest\, since it allows analysis of
an interior of the black holes.\n\n\nThe diagrams can improve our underst
anding of the peculiarities of communication outside and inside horizon of
black holes [2] and issues like self-focusing or dimensional reduction [3
]. What is more significant light rays of infinite angular momentum observ
ed inside horizon seems to be pictured clearly in this picture. The diagra
ms can also serve as a suitable illustration of a well-known problem of a
Doppler shift near the event horizon [4\,5\,6] and can be useful in determ
ination of a size of a black hole (problem of black hole shadow) [7].\n\n[
1] Dean B\, Am. J. Phys. 67\, 78 (1999)\n[2] A. Augousti et al.\, Eur. J.
Phys 33\, 1 (2012)\n[3] K. Umetsu\, Phys.Lett. B. Volume 692\, Issue 1 (20
10)\n[4] Toporensky\, A. et al. Eur.Phys.J. C77 (2017) no.3\, 179 arXiv:16
11.09807\n[5] Radosz\, A. et al. Phys.Lett. A373 (2009) 801-803 arXiv:0901
.1470 [gr-qc]\n[6] Toporensky\, A. et al. arXiv:1704.08308 [gr-qc]\n[7] A.
Abdujabbarov et al.\, arXiv:1512.05206 [gr-qc]\n\nhttps://indico.cern.ch/
event/588228/contributions/2641241/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641241/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Image formation in strong gravitational field: proximity of a Schw
arzschild black hole’s horizon
DTSTART;VALUE=DATE-TIME:20170926T133500Z
DTEND;VALUE=DATE-TIME:20170926T135000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641243@indico.cern.ch
DESCRIPTION:Speakers: Katarzyna Chajnowska (Wroclaw University of Science
and Technology\, Faculty of Fundamental Problems of Technology)\nWave opti
cs aspects of image formation in strong gravitational fields (in a vicinit
y of a black hole’s horizon) are discussed. We consider two observers A
and B placed (co) radially\, r(A)\n\nhttps://indico.cern.ch/event/588228/
contributions/2641243/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641243/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Power spectrum and bispectrum in light mass Galileon
DTSTART;VALUE=DATE-TIME:20170926T132000Z
DTEND;VALUE=DATE-TIME:20170926T133500Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641238@indico.cern.ch
DESCRIPTION:Speakers: Md. Wali Hossain (APCTP)\nCosmological perturbations
along with the background cosmology\, in light mass Galileon scenario\, w
ill be discussed. Light mass Galileon is a cubic Galileon model with poten
tial and nonminimal coupling. Effects of the nonminimal coupling on power
spectrum and bispectrum will be discussed.\n\nhttps://indico.cern.ch/event
/588228/contributions/2641238/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641238/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the Calculation of the Time Delay Between Gravitationally Lense
d Images When Peculiar Motions are Taken into Account
DTSTART;VALUE=DATE-TIME:20170926T130500Z
DTEND;VALUE=DATE-TIME:20170926T132000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641239@indico.cern.ch
DESCRIPTION:Speakers: Gihan Weerasekara (University of Colombo)\nAn interv
ening galaxy acts like a gravitational lens and produce multiple images of
a single source such as a remote galaxy. Such galaxies have peculiar spee
ds in addition to the bulk motion appearing due to the expansion of the un
iverse. There is a difference in light arriving time known as the time del
ay. We calculate more realistic time delays when such peculiar motions are
taken into consideration.\n\nhttps://indico.cern.ch/event/588228/contribu
tions/2641239/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641239/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tsallis non-extensive statistical mechanics of the self-gravitatin
g gas
DTSTART;VALUE=DATE-TIME:20170926T125000Z
DTEND;VALUE=DATE-TIME:20170926T130500Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641186@indico.cern.ch
DESCRIPTION:Speakers: Viridiana Pineda Reyes (Instituto de Ciencias Nucle
ares\, UNAM)\nIt is well known that the study of many-body systems in the
presence of long-range interactions (1/r^a\, a>1) within the context of Bo
ltzmann-Gibbs statistical mechanics is unsuccessful. The configurational i
ntegral contained in the partition function diverges\, preventing us from
a proper probabilistic analysis of the system. This motivates us to descri
be our system by a non-additive and non-extensive entropy\, i.e. the Tsall
is entropy. Non-extensive statistical mechanics emerge as a powerful way t
o describe these systems. We present an analysis of a self-gravitating non
-relativistic gas at thermal equilibrium using Tsallis non-extensive stati
stical mechanics\, proposing an alternative more consistent way to study a
stronomical self-gravitational systems\, and discuss the results and possi
ble issues arising with our approach.\n\nhttps://indico.cern.ch/event/5882
28/contributions/2641186/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641186/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TT tensors in flat spaces of any dimension
DTSTART;VALUE=DATE-TIME:20170926T102000Z
DTEND;VALUE=DATE-TIME:20170926T104000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2629755@indico.cern.ch
DESCRIPTION:Speakers: Jacek Tafel (University of Warsaw)\nTraceless tensor
s with vanishing divergence (TT tensors) play a big role in the initial va
lue problem in general relativity. They are solutions of the momentum cons
traints which can be extended to solutions of the full system of constrain
ts by means of the conformal method of Lichnerowicz. First\, we describe a
ll divergence-free tensors T in flat spaces in terms of potentials which f
orm a four index tensor R with all algebraic symmetries of the Riemann ten
sor. This tensor admits a big group of gauge transformations which can be
used to simplify it. If T is traceless then we can choose R to be traceles
s too\, so it has all properties of the Weyl tensor. Still it can be furth
er reduced by means of gauge transformations.\n\nhttps://indico.cern.ch/ev
ent/588228/contributions/2629755/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2629755/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Status of the Polgraw-Virgo group. Search for gravitational waves
from rotating neutron stars in LIGO O1 data
DTSTART;VALUE=DATE-TIME:20170926T074500Z
DTEND;VALUE=DATE-TIME:20170926T083000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2650929@indico.cern.ch
DESCRIPTION:Speakers: Andrzej Królak ()\nI shall briefly summarize recent
contributions of the Polgraw-Virgo group to the effort for searches of g
ravitational waves by the LIGO-Virgo consortium. I shall present details o
f the searches for gravitational wave signals from rotating neutron stars
done by the team from the Polgraw-Virgo group. I shall present both search
es for known pulsars like Crab and Vela and blind searches in the whole of
our Galaxy.\n\nhttps://indico.cern.ch/event/588228/contributions/2650929/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2650929/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Game of frames: Jordan vs. Einstein - dynamical systems approach
DTSTART;VALUE=DATE-TIME:20170925T163000Z
DTEND;VALUE=DATE-TIME:20170925T165000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2630860@indico.cern.ch
DESCRIPTION:Speakers: Orest Hrycyna (National Centre for Nuclear Research)
\nTBA\n\nhttps://indico.cern.ch/event/588228/contributions/2630860/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2630860/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark Inflation
DTSTART;VALUE=DATE-TIME:20170925T155000Z
DTEND;VALUE=DATE-TIME:20170925T161000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641228@indico.cern.ch
DESCRIPTION:Speakers: Michal Artymowski (Jagiellonian University)\nI will
present the Idea of an inflaton without direct couplings to any additional
fields. I will show a possible mechanisms of reheating together with impl
ications of dark inflation on predictions of inflation\, dark energy\, dar
k matter\, thermal history of the Universe\, electro-weak phase transition
and gravitational waves production.\n\nhttps://indico.cern.ch/event/58822
8/contributions/2641228/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641228/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The two way Bridge between Observations and Loop Quantum Cosmology
DTSTART;VALUE=DATE-TIME:20170925T071000Z
DTEND;VALUE=DATE-TIME:20170925T075500Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2703987@indico.cern.ch
DESCRIPTION:Speakers: Abhay Ashtekar (Pennsylvania State University\, USA)
\nThanks to the spectacular observational advances since the 1990s\, a 'st
andard model' of the early universe has now emerged. However\, since it is
based on quantum field theory in curved space-times\, it is not applicabl
e in the Planck regime. Using techniques from loop quantum gravity\, the t
heory can be extended over the 12 orders of magnitude in density and curva
ture from the onset of inflation all the way back to the Planck regime\, p
roviding us with a candidate completion of the standard model. Contrary to
a wide-spread belief\, the resulting pre-inflationary dynamics can have o
bservational consequences. Thus\, two way bridge has now opened between ob
servations and fundamental theory. The talk will provide a broad overview
of these results.\n\nhttps://indico.cern.ch/event/588228/contributions/270
3987/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2703987/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dirac fields in hybrid loop quantum cosmology
DTSTART;VALUE=DATE-TIME:20170925T075500Z
DTEND;VALUE=DATE-TIME:20170925T084000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2703991@indico.cern.ch
DESCRIPTION:Speakers: Guillermo A. Mena Marugán (Instituto de Estructura
de la Materia\, Spain)\nWe introduce Dirac fields in hybrid loop quantum c
osmology and study their behavior as part of the primordial perturbations\
, additional to those of the geometry and the inflaton field. With a conve
nient ansatz for physical quantum states\, we show how to deduce a Schrodi
nger equation that dictates the quantum evolution of these fermionic pertu
rbations. Remarkably\, such evolution is unitary\, and couples the fermion
field with an infinite sequence of quantum moments of the homogeneous geo
metry. We also discuss some issues related with the quantum backreaction p
roduced by the Dirac fields.\n\nhttps://indico.cern.ch/event/588228/contri
butions/2703991/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2703991/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stochastic inflation
DTSTART;VALUE=DATE-TIME:20170927T143000Z
DTEND;VALUE=DATE-TIME:20170927T145000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2628689@indico.cern.ch
DESCRIPTION:Speakers: Zbigniew Haba (University of Wrocław)\nIt is possib
le to include unobservable fields and particles in cosmological models (wa
rm inflation of Berera and Moss) as well as contribution of quantum fluctu
ations (Starobinsky\, Vilenkin) by adding a noise term to classical equati
ons. Such a noise term breaks the energy-momentum conservation. I introduc
e a compensating term to the energy-momentum repairing the conservation la
ws. Solutions of the resulting stochastic Einstein equations will be discu
ssed.\n\nhttps://indico.cern.ch/event/588228/contributions/2628689/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2628689/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Two-dimensional moving mirrors and the information loss problem
DTSTART;VALUE=DATE-TIME:20170926T165000Z
DTEND;VALUE=DATE-TIME:20170926T171000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641244@indico.cern.ch
DESCRIPTION:Speakers: Dong-han Yeom ()\nIn this presentation\, we investig
ate the information flow of two-dimensional moving mirrors. Here we point
out that various mirror trajectories can help to mimic different candidate
resolutions to the information loss paradox following the semi-classical
quantum field theory: (i) a suddenly stopping mirror corresponds to the as
sertion that all information is attached to the last burst\, (ii) a slowly
stopping mirror corresponds to the assertion that thermal Hawking radiati
on carries information\, and (iii) a long propagating mirror corresponds t
o the remnant scenario. Based on such analogy\, we find that the last burs
t of a black hole cannot contain enough information\, while slowly emittin
g radiation can restore unitarity. For all cases\, there is an apparent in
consistency between the picture based on quantum entanglements and that ba
sed on the semi-classical quantum field theory. Based on the quantum entan
glement theory\, a stopping mirror will generate a firewall-like violent e
mission which is in conflict with notions based on the semi-classical quan
tum field theory.\n\nhttps://indico.cern.ch/event/588228/contributions/264
1244/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641244/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inflationary scenario in Starobinski-Palatini FLRW cosmology
DTSTART;VALUE=DATE-TIME:20170927T162000Z
DTEND;VALUE=DATE-TIME:20170927T164000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641053@indico.cern.ch
DESCRIPTION:Speakers: Andrzej Borowiec (University of Wrocław)\nWe review
some recent results concerning inflationary scenario in the framework of
Starobinski-Palatini FLRW cosmology\, which can be reduced to the two-dime
nsional singular (piecewise-smooth) dynamical system of Newtonian type. Th
erefore\, it can be describe in geometric terms of the corresponding poten
tial function. Analytical calculations are given for the case with dust ma
tter and cosmological constant. We investigate the model in both Jordan an
d Einstein frames. We demonstrate that after transition to the Einstein fr
ame we obtain both decaying Lambda and the form of a scalar field potentia
l. In particular\, we discuss slow-roll parameters\, graceful exit and con
front the model against observational data.\n\nhttps://indico.cern.ch/even
t/588228/contributions/2641053/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641053/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New tetrads in Riemannian geometry and new ensuing results in grou
p theory\, gauge theory and fundamental physics\, in particle physics\, ge
neral relativity and astrophysics.
DTSTART;VALUE=DATE-TIME:20170927T131000Z
DTEND;VALUE=DATE-TIME:20170927T133000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641202@indico.cern.ch
DESCRIPTION:Speakers: Alcides Garat (Former Professor at Universidad de la
Republica\, Montevideo\, Uruguay.)\nA new technique is presented in order
to build tetrads in four-dimensional Lorentzian spacetimes. These tetrads
have special useful properties in general relativity\, astrophysics and a
lso particle physics. A new fundamental result is proved in group theory.
The group SO(2) (spatial rotations) is isomorphic to the group SO(1\; 1) (
boosts) plus two kinds of discrete transformations. One of them is not Lor
entzian. That is\, a compact group is isomorphic to a non-compact group pl
us two different kinds of discrete transformations (1\;2). The electromagn
etic local gauge group is proved to be isomorphic to the local group of tr
ansformations of these particular kind of tetrads. Therefore\, establishin
g a concrete link between internal and spacetime local groups of transform
ations. These new tetrads also diagonalize the electromagnetic stress-ener
gy tensor for non-null electromagnetic fields\, any stress-energy tensor\,
in a general\, covariant and local way. These new tetrads also introduce
maximum simplification in the Einstein-Maxwell differential equations\, an
d introduce maximum\nsimplification in the expression of the electromagnet
ic field itself\, in any curved four-dimensional Lorentzian spacetime\, al
lowing for the identification of its degrees of freedom in two local scala
rs. These tetrads introduce simplification in spacetime evolution algorith
ms\, specially in astrophysical situations related\, for example\, to neut
ron stars (3). This new tetrad can be applied and introduce simplification
in the analysis of astrophysical relativistic problems where vorticity is
present through the Carter-Lichnerowicz equation (4).\n\nREFERENCES\n(1)
A. Garat\, Tetrads in geometrodynamics\, J. Math. Phys. 46\, 102502 (2005)
. arXiv:gr-qc/0412037\n(2) A. Garat\, Tetrads in Yang-Mills geometrodynami
cs\, Gravitation and Cosmology\, (2014) Vol.20 No. 1\, pp. 116-126. Pleiad
es Publishing Ltd. arXiv:gr-qc/0602049.\n(3) A. Garat\, Euler observers in
geometrodynamics\, Int. J. Geom. Meth. Mod. Phys.\, Vol. 11 (2014)\, 1450
060. arXiv:gr-qc/1306.4005\n(4) A. Garat\, Covariant diagonalization of th
e perfect fluid stress-energy tensor\, Int. J. Geom. Meth. Mod. Phys.\, Vo
l. 12 (2015)\, 1550031. arXiv:gr-qc/1211.2779\n\nhttps://indico.cern.ch/ev
ent/588228/contributions/2641202/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641202/
END:VEVENT
BEGIN:VEVENT
SUMMARY:From hyperheavenly spaces to complex and real\, twisting type [N]x
[N] spaces
DTSTART;VALUE=DATE-TIME:20170927T125000Z
DTEND;VALUE=DATE-TIME:20170927T131000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641199@indico.cern.ch
DESCRIPTION:Speakers: Adam Chudecki (Lodz University of Technology)\nRecen
tly\, the existence of gravitational waves has been confirmed in experimen
ts. It is worth then to analyze once again one of the most intriguing open
problems of the general theory of relativity: the problem of vacuum type
N with twist. It is well known that according to the "peeling off theorem
" the graviational radiation far away from a bounded source is of the type
N. All vacuum type N metrics can be divided into four classes. Three clas
ses are explicitly known. They are characterized by the vanishing of the t
wist (parameter which describes the properties of the congruences of the n
ull geodesics). All of them have singularities and this is the reason why
they cannot be treated as a model of the gravitational radiation. Among th
e metrics with nonzero twist only one solution is known explicitly (Hauser
\, 1974). This solution has singularities as well. Plenty different approa
ches to the twisting vacuum type N problem have been presented for last 40
years. Existence of the Killing vectors (KV) or homothetic Killing vector
s (HKV) simplify the problem a little. Nevertheless\, even two KV or one K
V and one HKV enable us to reduce the field equations to the strongly nonl
inear and complicated ODE of the third order. A few forms of such equation
s have been proposed by different authors. For some values of the homothet
ic parameter these equations become easier and shorter\, but we are still
far from the finding the explicit solutions other than the Houser's one. I
n what follows we present the approach to the twisting vacuum type N probl
em by studying hyperheavenly spaces equipped with two KV or one KV and one
HKV. The field equations are reduced to the nonlinear ODE of the fifth or
der. Our considerations remain valid in all 4-dimensional real spaces of a
rbitrary signature\, as well as in the complex spaces. Finally\, some new
family of the metrics which admit two Killing vectors is presented. It see
ms\, that this family does not admit any Lorentzian real slice.\n\nhttps:/
/indico.cern.ch/event/588228/contributions/2641199/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641199/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nonlinear Field Space Theory and Cosmology
DTSTART;VALUE=DATE-TIME:20170926T163000Z
DTEND;VALUE=DATE-TIME:20170926T165000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641184@indico.cern.ch
DESCRIPTION:Speakers: Tomasz Trześniewski (University of Wrocław)\nThe c
oncept of a field theory with nonlinear phase space has recently been intr
oduced\, inspired by nontrivial geometry of the particles' phase spaces ap
pearing in several approaches to quantum gravity. In particular\, it has b
een applied in the context of cosmological inflation\, by considering a sc
alar field theory with spherical phase space\, defined on the standard FRW
background (i.e. general relativity itself is not modified). The scalar f
ield Hamiltonian is assumed to correspond to the continuous XXZ Heisenberg
model of a system of spins. For the homogenous cosmology the nonlinearity
of the field phase space turns out to be relevant at late cosmological ti
mes\, when it may lead to a recollapse of universe\, while at early times
there is a possibility of a bounce\, avoiding the initial singularity. Qua
ntum perturbations of the field have been studied in the linear approximat
ion but taking into account the Lorentz symmetry breaking term in the fiel
d Hamiltonian. This leads to a correction to the ordinary amplitude of per
turbations and a generalization of the Bunch-Davies vacuum state\, while t
he inflationary spectral index remains unchanged in the leading order. The
discussed framework is potentially able to bring cosmology and condensed
matter physics closer together.\n\nhttps://indico.cern.ch/event/588228/con
tributions/2641184/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641184/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Linear perturbations of spherically symmetric black holes in Lovel
ock theories
DTSTART;VALUE=DATE-TIME:20170926T145000Z
DTEND;VALUE=DATE-TIME:20170926T151000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2701140@indico.cern.ch
DESCRIPTION:Speakers: Alexander Zhidenko (Universidade Federal do ABC\, Br
azil)\nWe analyze spherically symmetric black holes in the general Loveloc
k gravity for different asymptotics (flat\, dS\, AdS). We find numerically
the metric coefficients of the physically relevant branch of the solution
s and the corresponding effective potentials for the gravitational perturb
ations. We also perform a comprehensive analysis of the eikonal instabilit
ies of the black holes.\n\nhttps://indico.cern.ch/event/588228/contributio
ns/2701140/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2701140/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A possible connection of blueshifts in the Lemaitre - Tolman and S
zekeres models with the gamma-ray bursts
DTSTART;VALUE=DATE-TIME:20170925T131000Z
DTEND;VALUE=DATE-TIME:20170925T133000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2624965@indico.cern.ch
DESCRIPTION:Speakers: Andrzej Krasiński (N. Copernicus Astronomical Cente
r\, Polish Academy of Sciences)\nAs known since 1980\, some light rays emi
tted from the Big Bang (BB) in a\nLemaitre - Tolman (L-T) model reach all
observers with an infinite blueshift.\nThis happens when at the emission p
oint the BB function t_B(r) has nonzero\nderivative and the ray propagates
radially. Some authors portrayed the existence\nof blueshifts as a disast
er disqualifying the L-T models. This author recently\nproposed that blues
hifted rays are actually observed as gamma-ray bursts (GRBs).\nTwo papers
were published. In the first one\, it was shown that L-T based models\nof
GRB sources successfully account for the energies of the GRBs\, the large\
ndistances to them\, their multitude\, and for the existence of the afterg
lows.\nHowever\, these models did not account for the durations of the GRB
s and of the\nafterglows and for their (hypothetical) collimation into nar
row jets. In the\nsecond paper\, the existence and properties of blueshift
s were investigated in\nexemplary Szekeres models. In them\, infinite blue
shifts may arise only along two\nopposite directions\, so the collimation
is accounted for. The third paper\, now\nsubmitted for publication\, shows
how realistic Szekeres-based models of GRBs\nimprove upon the L-T based m
odels. Currently\, I work on accounting for the\nduration of the GRBs and
their afterglows\, but the work is not yet completed.\n\nhttps://indico.ce
rn.ch/event/588228/contributions/2624965/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2624965/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Particle content of gravity theories with Lagrangians explicitly d
epending on the Weyl tensor
DTSTART;VALUE=DATE-TIME:20170927T160000Z
DTEND;VALUE=DATE-TIME:20170927T162000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2640823@indico.cern.ch
DESCRIPTION:Speakers: Leszek Sokołowski (Astronomical Observatory\, Jagie
llonian University)\nWe present a modified method of investigation of part
icle content of a metric theory of gravitation whose Lagrangian explicitl
y depends on the Weyl tensor. Without any resort to observations we consi
der the problem from purely field–theoretical viewpoint. We apply the te
net of field theory that each classical field should correspond to a quant
um particle with definite mass and spin and deterministic dynamics. These
features may be established only for free fields (decoupled from spacetime
curvature) and this is achieved by putting all coupling constants in the
gravitational Lagrangian equal to zero. This method shows the Lagrangian s
hould be free of the Weyl tensor since it generates a field in a gravitati
onal multiplet which is dynamically undetermined and in consequence has no
definite mass and spin.\n\nhttps://indico.cern.ch/event/588228/contributi
ons/2640823/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2640823/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Universal electromagnetic fields
DTSTART;VALUE=DATE-TIME:20170927T154000Z
DTEND;VALUE=DATE-TIME:20170927T160000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641231@indico.cern.ch
DESCRIPTION:Speakers: Marcello Ortaggio ()\nAbstract: Already in the 30s\,
Schroedinger observed that all null Maxwell fields solve the equations fo
r the electromagnetic field in any non-linear electrodynamics. More genera
lly\, we study properties of “universal” p-forms\, i.e.\, electromagne
tic fields that solve simultaneously any generalized electrodynamics (for
which the field equations contain arbitrary powers and derivatives of the
field strength). Some results including the coupling to Einstein's gravit
y are also discussed\, and analogies with “universal spacetimes” (whic
h solve simultaneously virtually any theory of gravity) mentioned.\n\nRefs
.: M. Ortaggio\, V. Pravda\, Electromagnetic fields with vanishing scalar
invariants\, Class.Quant.Grav. 33 (2016)\, 115010\; S. Hervik\, M. Ortaggi
o\, V. Pravda\, to appear\n\nhttps://indico.cern.ch/event/588228/contribut
ions/2641231/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641231/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black hole initial data within the parabolic-hyperbolic formulatio
n
DTSTART;VALUE=DATE-TIME:20170927T152000Z
DTEND;VALUE=DATE-TIME:20170927T154000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2617379@indico.cern.ch
DESCRIPTION:Speakers: Anna Nakonieczna (University of Warsaw\, Poland)\nTh
e parabolic-hyperbolic formulation of the initial data of the Einstein equ
ations for multiple black holes systems has been proposed recently [1-3].
It provides an alternative to the traditional conformal method [4]. During
the talk\, a numerical implementation of the approach to the initial data
problem of general relativity will be presented. It will involve black ho
les described by a metric of a Kerr-Schild form.\n\n[1] I.Racz\, Constrain
ts as evolutionary systems\, Class. Quant. Grav. 33\, 015014 (2016).\n[2]
I.Racz\, A simple method of constructing binary black hole initial data\,
arXiv:1605.01669 (2017).\n[3] I.Racz\, On the ADM charges of multiple blac
k holes\, arXiv:1608.02283 (2017).\n[4] G.B.Cook\, Initial data for numeri
cal relativity\, Living Rev. Rel. 3\, 5 (2000).\n\nhttps://indico.cern.ch/
event/588228/contributions/2617379/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2617379/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quasi-local Hamiltonian - four decades of Kijowski's formula
DTSTART;VALUE=DATE-TIME:20170927T133000Z
DTEND;VALUE=DATE-TIME:20170927T135000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2629730@indico.cern.ch
DESCRIPTION:Speakers: Jacek Jezierski (University of Warsaw)\nI will revie
w quasi-local aspects of the gravitational field\, in particular\, energy
as a Hamiltonian for the finite region. The considerations are closely rel
ated to the initial boundary problem for the gravitational field.\n\nhttps
://indico.cern.ch/event/588228/contributions/2629730/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2629730/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rotating Bowen-York initial data with a positive cosmological cons
tant
DTSTART;VALUE=DATE-TIME:20170927T135000Z
DTEND;VALUE=DATE-TIME:20170927T141000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2624962@indico.cern.ch
DESCRIPTION:Speakers: Patryk Mach (Jagiellonian University)\nI investigate
rotating Bowen-York-type initial data for Einstein equations with a posit
ive cosmological constant. They are obtained using the so-called conformal
method. From the technical point of view\, its most important part amount
s to solving a corresponding Lichnerowicz equation. The first analysis of
this equation was recently published by Bizoń\, Pletka and Simon. Here I
focus on additional branches of its solutions\, bifurcating from the alrea
dy known ones. I will briefly discuss the numerical method used to find su
ch solutions\, and also comment on the completeness of the obtained bifurc
ation diagram.\n\nhttps://indico.cern.ch/event/588228/contributions/262496
2/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2624962/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inter-universal entanglement in the multiverse
DTSTART;VALUE=DATE-TIME:20170927T141000Z
DTEND;VALUE=DATE-TIME:20170927T143000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2617547@indico.cern.ch
DESCRIPTION:Speakers: Mariusz Dąbrowski (University of Szczecin)\nStartin
g from the cyclic models of the parallel universes with different evolutio
n of the fundamental constants and the same geometry I will study the quan
tum mechanical entanglement problem of the classically separated universes
. The basic approach will be based on the third-quantization formalism of
quantum cosmology. Some interesting properties of quantum entanglement (en
tropy and temperature) at the points corresponding to classical singularit
ies and maximum expansion will be discussed. \n\nRef: K. Marosek et al. MN
RAS\, 461\, 2777 (2016)\; S.Robles-Perez et al. Phys. Rev. D. 95\, 085505
(2017)\n\nhttps://indico.cern.ch/event/588228/contributions/2617547/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2617547/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spacetime near an extremal horizon
DTSTART;VALUE=DATE-TIME:20170927T102500Z
DTEND;VALUE=DATE-TIME:20170927T104500Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641220@indico.cern.ch
DESCRIPTION:Speakers: Carmen Li (The University of Warsaw)\nI will discuss
the inverse problem of determining the spacetime near an extremal Killing
horizon with a prescribed\, spatially compact near-horizon geometry. I wi
ll show that in Einstein-Maxwell theory with a cosmological constant\, the
Einstein and Maxwell equations for the infinitesimal deformations transve
rse to the horizon reduce to a system of elliptic PDEs for the extrinsic c
urvature of a cross-section of the horizon and the vector potential on the
cross-section\, hence there exists a finite dimensional moduli space of s
uch deformations. I will then discuss the most general axisymmetric transv
erse deformation of a Kerr-Newman horizon.\n\nhttps://indico.cern.ch/event
/588228/contributions/2641220/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641220/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Linear perturbations of the near horizon extremal Kerr geometry
DTSTART;VALUE=DATE-TIME:20170927T104500Z
DTEND;VALUE=DATE-TIME:20170927T110500Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2630842@indico.cern.ch
DESCRIPTION:Speakers: Sebastian Szybka (Jagiellonian University)\nWe show
nonexistence of non-trivial solutions of the linearised near-horizon equat
ions at the Kerr metric.\n\nhttps://indico.cern.ch/event/588228/contributi
ons/2630842/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2630842/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Remarks (mainly historical) on the theory of relativistic classica
l spinning particles
DTSTART;VALUE=DATE-TIME:20170927T090000Z
DTEND;VALUE=DATE-TIME:20170927T094500Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2703988@indico.cern.ch
DESCRIPTION:Speakers: Henryk Arodź (Jagiellonian University\, Poland)\nht
tps://indico.cern.ch/event/588228/contributions/2703988/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2703988/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mathisson's Equations without Him
DTSTART;VALUE=DATE-TIME:20170927T094500Z
DTEND;VALUE=DATE-TIME:20170927T100500Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641229@indico.cern.ch
DESCRIPTION:Speakers: Roman Plyatsko (Pidstryhach Institute for Applied Pr
oblems in Mechanics and Mathematics)\nThe main stages of investigations of
spinning particle motions in\n general relativity\, that are described by
the equations which appeared\n in literature in 1937 due to the pioneer p
aper of Myron Mathisson\n (1897-1940)\, are under consideration. Period fr
om 1940s up today is\n included. The specific properties of the highly rel
ativistic regime of\n the spin-gravity coupling and spinning particle moti
ons in the\n Schwarzschild\, Kerr\, and Schwarzschild-de Sitter background
s are\n discussed.\n\nhttps://indico.cern.ch/event/588228/contributions/26
41229/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641229/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The problem of characterising stationary data for the vacuum Einst
ein Equations
DTSTART;VALUE=DATE-TIME:20170927T074500Z
DTEND;VALUE=DATE-TIME:20170927T083000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2704000@indico.cern.ch
DESCRIPTION:Speakers: Paul Tod (University of Oxford\, UK)\nhttps://indico
.cern.ch/event/588228/contributions/2704000/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2704000/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A new method of constructing binary black hole initial data
DTSTART;VALUE=DATE-TIME:20170927T070000Z
DTEND;VALUE=DATE-TIME:20170927T074500Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2631930@indico.cern.ch
DESCRIPTION:Speakers: Istvan Racz (Wigner RCP\, Budapest\, Hungary)\nBy ap
plying a parabolic-hyperbolic formulation of the constraints and superposi
ng Kerr-Schild black holes\, a simple method is introduced to initialize t
ime evolution of binary systems. As the input parameters are essentially t
he same as those used in the post-Newtonian (PN) setup the proposed method
interrelates various physical expressions applied in PN and in fully rela
tivistic formulations. The global ADM charges are also determined by the i
nput parameters\, and no use of boundary conditions in the strong field re
gime is made.\n\nhttps://indico.cern.ch/event/588228/contributions/2631930
/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2631930/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase structure of CDT quantum gravity
DTSTART;VALUE=DATE-TIME:20170926T161000Z
DTEND;VALUE=DATE-TIME:20170926T163000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641224@indico.cern.ch
DESCRIPTION:Speakers: Dániel Németh (Eötvös Loránd Science University
)\nCausal Dynamical Triangulations (CDT) is a lattice field theory of quan
tum gravity based on Regge calculus which can be studied using Monte Carlo
techniques. The key feature of CDT is an introduction of a global proper
time foliation into spatial hypersurfaces and a requirement that spatial t
opology is fixed. Measurements showed that CDT parametrized by bare coupli
ng constants of the Regge action has a complicated phase structure. Under
spherical topology four phases appeared\, and they most likely have a comm
on point\, a so called "quadrupole" point. The phase transitions were also
measured and it was shown that there exists phase transitions of second
or higher order\, which opens a possibility of investigating the UV limit.
We recently measured the phase structure in toroidal topology that appea
red to be quite similar to the one observed in spherical case. This may in
dicate that the phase structure is independent from the topology of the un
iverse.\n\nhttps://indico.cern.ch/event/588228/contributions/2641224/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641224/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational Scattering Amplitudes and Closed String Field Theory
DTSTART;VALUE=DATE-TIME:20170926T155000Z
DTEND;VALUE=DATE-TIME:20170926T161000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641219@indico.cern.ch
DESCRIPTION:Speakers: Taejin Lee (Kangwon National University)\nWe constru
ct a closed string field theory in the proper-time gauge which is the clos
ed analog of the deformed cubic open string field theory and define the ge
neral closed string scattering amplitudes. Taking the zero-slope limit\, w
e explicitly evaluate the three-graviton scattering amplitudes and the fou
r-graviton scattering amplitudes. We discuss in the framework of the close
d string field theory\, the Kawai-Lewellen-Tye (KLT) relations\, which rel
ate the tree level string scattering amplitudes of closed string to those
of open string.\n\nhttps://indico.cern.ch/event/588228/contributions/26412
19/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641219/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-Schwarzschild black-hole metrics in alternative theories of gr
avity: analytical approximations
DTSTART;VALUE=DATE-TIME:20170926T143000Z
DTEND;VALUE=DATE-TIME:20170926T145000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641225@indico.cern.ch
DESCRIPTION:Speakers: Roman Konoplya ()\nHigher derivative extensions of E
instein gravity are important within the string theory approach to gravity
and as alternative and effective theories of gravity.\nWe consider two nu
merical black-hole solution: by P. Kanti\, et. al. in the Einstein-dilaton
-Gauss-Bonnet theory [Phys.Rev. D54 (1996) 5049-5058] and \nthe one by H.
L\\"u\, A. Perkins\, C. Pope\, K. Stelle [Phys.Rev.Lett. 114 (2015)\, 1716
01] in the Einstein gravity with added higher derivative terms. Using the
general and quickly convergent parametrization in terms of the continued f
ractions\, we represent these numerical solution in the analytical forms w
hich are accurate not only near the event horizon or far from black hole\,
but in the whole space. Thereby\, the obtained analytical forms of the me
trics allow one to study easily all the further properties of the black ho
les\, such as thermodynamics\, Hawking radiation\, particle motion\, accre
tion\, perturbations\, stability\, quasinormal spectrum\, etc. Thus\, the
found analytical approximate representations can serve in the same way as
exact solutions.\n\nhttps://indico.cern.ch/event/588228/contributions/2641
225/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641225/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black hole hair formation in shift-symmetric generalised scalar-te
nsor gravity
DTSTART;VALUE=DATE-TIME:20170926T135000Z
DTEND;VALUE=DATE-TIME:20170926T141000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641230@indico.cern.ch
DESCRIPTION:Speakers: Robert Benkel (University of Nottingham)\nA linear c
oupling between a scalar field and the Gauss–Bonnet invariant is the onl
y known interaction term between a scalar and the metric that: respects sh
ift symmetry\; does not lead to higher order equations\; inevitably introd
uces black hole hair in asymptotically flat\, 4-dimensional spacetimes. I
will consider a scalar-tensor theory of gravity that includes such a coupl
ing and present results of numerical simulations of hair formation in a st
atic\, spherically symmetric background. I will also show that backgrounds
describing stellar collapse yield similar field configurations. I will th
en discuss the physical implications of these results and possible extensi
ons of our work to rotating spacetimes.\n\nhttps://indico.cern.ch/event/58
8228/contributions/2641230/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641230/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kappa-deformation as an ultraviolet cutoff
DTSTART;VALUE=DATE-TIME:20170926T151000Z
DTEND;VALUE=DATE-TIME:20170926T153000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2699483@indico.cern.ch
DESCRIPTION:Speakers: Jerzy Kowalski-Glikman (University of Wrocław)\nTBA
\n\nhttps://indico.cern.ch/event/588228/contributions/2699483/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2699483/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational entropy and the cosmological “no-hair” conjectur
e
DTSTART;VALUE=DATE-TIME:20170926T100000Z
DTEND;VALUE=DATE-TIME:20170926T102000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2617546@indico.cern.ch
DESCRIPTION:Speakers: Krzysztof Bolejko (The University of Sydney)\n*Gravi
tational entropy and the cosmological “no-hair” conjecture*\n\nGravita
tional entropy [1] and the “no-hair” conjectures [2\, 3] are seemingly
contradictory: the growth of the first one is associated with the growth
of inhomogeneity [4\, 5\, 6]\, while the second one argues that the dark e
nergy dominated Universe will asymptotically approach a homogeneous and is
otropic de Sitter state[7\, 8]. \nIn my talk I will present the analysis o
f both of these conjectures within the silent universes [9\, 10]. Irrotati
onal silent universes belong to a class of systems where each worldline ev
olves independently of other worldlines - there is no communication betwee
n the worldlines\, i.e. no pressure gradients\, no energy flux\, no gravit
ational radiation. In my talk I will discuss properties and evolution of t
he irrotational silent universe. I will focus on the gravitational entropy
and future asymptotic state of the silent universe dominated by dark ener
gy [11]. Finally\, I will comment on the gravitational entropy of gravitat
ional waves.\n\n\nReferences\n\n[1] T. Clifton\, G. F. R. Ellis\, and R. T
avakol\, “A gravitational entropy proposal\,” Classical and Quantum Gr
avity\, vol. 30\, p. 125009\, 2013.\n\n[2] G. Götz\, “On the cosmologic
al ’no-hair’ conjecture\,” Physics Letters A\, vol. 128\, no. 3\, pp
. 129 – 132\, 1988.\n\n[3] L. G. Jensen and J. A. Stein-Schabes\, “Is
inflation natural?\,” Phys. Rev. D\, vol. 35\, pp. 1146–1150\, 1987.\n
\n[4] K. Bolejko and W. R. Stoeger\, “Intermediate homogenization of the
Universe and the problem of gravitational entropy\,” Phys. Rev. D\, vol
. 88\, no. 6\, p. 063529\, 2013.\n\n[5] R. A. Sussman and J. Larena\, “G
ravitational entropies in LTB dust models\,” Classical and Quantum Gravi
ty\, vol. 31\, p. 075021\, 2014.\n\n[6] R. A. Sussman \, “Gravitational
entropy of cosmic expansion\,” Astronomische Nachrichten\, vol. 335\, p.
587\, 2014.\n\n[7] R. M. Wald\, “Asymptotic behavior of homogeneous cos
mological models in the presence of a positive cosmological constant\,”
Phys. Rev. D\, vol. 28\, pp. 2118–2120\, 1983.\n\n[8] T. Pacher and J. A
. Stein-Schabes\, “On the Locality of the No Hair Conjecture and the Mea
sure of the Universe\,” Annalen der Physik\, vol. 503\, pp. 518–526\,
1991.\n\n[9] M. Bruni\, S. Matarrese\, and O. Pantano\, “Dynamics of sil
ent universes\,” Astroph. J.\, vol. 445\, pp. 958–977\, 1995.\n\n[10]
H. van Elst\, C. Uggla\, W. M. Lesame\, G. F. R. Ellis\, and R. Maartens\,
“Integrability of irrotational silent cosmological models\,” Classica
l and Quantum Gravity\, vol. 14\, pp. 1151–1162\, 1997.\n\n[11] K. Bolej
ko\, In preparation\, 2017.\n\nhttps://indico.cern.ch/event/588228/contrib
utions/2617546/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2617546/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational waves in Friedman-Lemaitre-Robertson-Walker cosmolog
y\, material perturbations and the Huygens principle
DTSTART;VALUE=DATE-TIME:20170926T092000Z
DTEND;VALUE=DATE-TIME:20170926T094000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641222@indico.cern.ch
DESCRIPTION:Speakers: Wojciech Kulczycki ()\nWe analyze propagation equati
ons for the polar modes of gravitational waves in cosmological space-times
. We prove that polar gravitational waves must perturb the density and non
-azimuthal components of the velocity of material medium of the Friedman-L
emaitre-Robertson-Walker space-times. Axial gravitational waves can in
uence only the azimuthal velocity. The whole gravitational dynamics reduce
s to the single "master equation" that has the same form as for axial mode
s. That allows us to conclude that the status of the Huygens principle is
the same for both axial and polar modes of gravitational waves. In particu
lar\, this principle is valid exactly in radiation spacetimes with the van
ishing cosmological constant\, and it is broken otherwise.\n\nhttps://indi
co.cern.ch/event/588228/contributions/2641222/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641222/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Properties of null one-way solution of Maxwell equations with sepa
rated variables in Kerr space-time
DTSTART;VALUE=DATE-TIME:20170926T094000Z
DTEND;VALUE=DATE-TIME:20170926T100000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641227@indico.cern.ch
DESCRIPTION:Speakers: Yurii Taistra (Pidstrygach Institute for Applied Pro
blems for Mechanics and Mathematics\, NAS of Ukraine)\, Volodymyr Pelykh (
Pidstrygach Institute for Applied Problems for Mechanics and Mathematics\,
NAS of Ukraine)\nWe are finding in class of null one-way fields solution
with separated variables of Maxwell equations in Kerr space-time. Obtaine
d solution describes left and right circularly-polarized waves. From this
solution we deduce the dependence of polarization rotation angle from f
requency as well as expression for phase shift.\n\nhttps://indico.cern.ch/
event/588228/contributions/2641227/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641227/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Axial gravitational waves in FLRW cosmology and memory effect
DTSTART;VALUE=DATE-TIME:20170926T090000Z
DTEND;VALUE=DATE-TIME:20170926T092000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641223@indico.cern.ch
DESCRIPTION:Speakers: Edward Malec ()\nWe show exemplary initial metrics
for gravitational axial waves\, that are twice differentiable but which a
re not $C^2$. They generate wave pulses that interact with matter in the r
adiation cosmological era. This forces the radiation matter to rotate. Thi
s rotation is permanent - it persists after the passage of the gravitatio
nal pulse. In contrast to that\, we explicitly show that a class of smoot
h initial metrics that are at least $C^2$ gives rise to gravitational wave
pulses that do not interact with the background during the radiation epoc
h.\n\nhttps://indico.cern.ch/event/588228/contributions/2641223/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641223/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On some recent results on total masses in GR
DTSTART;VALUE=DATE-TIME:20170926T070000Z
DTEND;VALUE=DATE-TIME:20170926T074500Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2703998@indico.cern.ch
DESCRIPTION:Speakers: Laszlo Szabados (Wigner Research Center for Physics\
, Hungary)\nhttps://indico.cern.ch/event/588228/contributions/2703998/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2703998/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Domain walls in curved spacetimes
DTSTART;VALUE=DATE-TIME:20170925T151000Z
DTEND;VALUE=DATE-TIME:20170925T153000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641183@indico.cern.ch
DESCRIPTION:Speakers: Filip Ficek (Jagiellonian University)\nTopological d
efects such as domain walls are present in many Beyond Standard Model theo
ries and cosmological models. We investigate the behaviour of a thick doma
in wall in the Kerr spacetime. We simulate the transit of a light domain w
all through the Kerr black hole to show how this behaviour depends on the
domain walls' parameters and the black hole's spin. We also point out the
presence of ringing modes.\n\nhttps://indico.cern.ch/event/588228/contribu
tions/2641183/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641183/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Relativistic low angular momentum accretion.
DTSTART;VALUE=DATE-TIME:20170925T153000Z
DTEND;VALUE=DATE-TIME:20170925T155000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2630855@indico.cern.ch
DESCRIPTION:Speakers: Michal Piróg (Jagiellonian University)\nI will repo
rt on the results of the joint numerical project with J.A. Font and P. Mac
h. We investigated low angular momentum accretion of inviscid fluids on bl
ack holes. The Newtonian calculation in this topic have been already done
by D. Proga and M. Begelman. Our work promotes their models to fully relat
ivistic setting. The staring point of those simulations is the Bondi-type
accretion solution\, perturbed by adding a small amount of angular momentu
m. The results of simulations will be discussed\, emphasizing the similari
ties and differences with Newtonian models.\n\nhttps://indico.cern.ch/even
t/588228/contributions/2630855/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2630855/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Size\, angular momentum and mass for objects
DTSTART;VALUE=DATE-TIME:20170925T145000Z
DTEND;VALUE=DATE-TIME:20170925T151000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2617380@indico.cern.ch
DESCRIPTION:Speakers: Pablo Anglada (FaMAF\, UNC and IFEG\, Conicet)\nWe p
resent a new geometrical inequality involving the ADM mass\, the angular m
omentum and the size of an ordinary axially symmetric object. The main too
l we use to use to prove it is the monotonicity of the Geroch quasi-local
energy along the inverse mean curvature flow. We also compute numerical ex
amples to test the robustness of our hypotheses and results.\n\nhttps://in
dico.cern.ch/event/588228/contributions/2617380/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2617380/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmological backreaction conjecture: recent developments
DTSTART;VALUE=DATE-TIME:20170925T133000Z
DTEND;VALUE=DATE-TIME:20170925T135000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2630468@indico.cern.ch
DESCRIPTION:Speakers: Jan Ostrowski (CRAL)\nInhomogeneous\, relativistic c
osmology has recently observed a rise in popularity among the cosmologists
. In particular\, the scalar averaging approach (Buchert formalism) has be
en intensively examined\nboth analytically and numerically\, giving some n
ew insights\ninto the problem of cosmological backreaction i.e. the conjec
tured influence of small scale density inhomogeneities on the large scale
evolution of the Universe. In my talk\, I will summarise these recent eff
orts\, including multi-scale partitioning approach and some results from N
-body simulations. I will also put into perspective future prospects of co
smological backreaction investigations.\n\nhttps://indico.cern.ch/event/58
8228/contributions/2630468/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2630468/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simple inhomogeneous cosmological model in the context of back rea
ction
DTSTART;VALUE=DATE-TIME:20170925T141000Z
DTEND;VALUE=DATE-TIME:20170925T143000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641204@indico.cern.ch
DESCRIPTION:Speakers: Szymon Sikora (Jagiellonian University)\nI present t
he cosmological model which approximates the periodically distributed dust
overdensities on the Einstein-de Sitter background.\nThe model constructi
on enables application of the Green-Wald averaging scheme and the Buchert
averaging technique simultaneously. \nThe comparison of the angular diamet
er distance obtained within the presented model and the angular diameter d
istances for the respective \naverage space-times is given.\n\nhttps://ind
ico.cern.ch/event/588228/contributions/2641204/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641204/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Formation of the first molecules in early Universe beyond the $\\L
ambda$CDM model
DTSTART;VALUE=DATE-TIME:20170925T135000Z
DTEND;VALUE=DATE-TIME:20170925T141000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641203@indico.cern.ch
DESCRIPTION:Speakers: Olga Sergijenko (Ivan Franko National University of
Lviv)\nWe study the formation of first molecules H$_2$ and HD\, negative H
ydrogen ions H$^-$\, molecular ions H$_2^+$ and HeH$^+$ in the pre-reioniz
ation Universe. The cosmological recombination is described within the fra
mework of modified model of the effective 3-level atom [Seager\, Sasselov
$\\&$ Scott\, 1999\; Wong\, Moss $\\&$ Scott\, 2008]\, while for the kinet
ics of chemical reactions we restrict consideration to the minimal model o
f [Galli $\\&$ Palla\, 1998] for Hydrogen\, Deuterium and Helium. It is fo
und that the uncertainties of molecular abundances caused by the inaccurac
ies in description of cosmological recombination are about 2-3$\\%$\, comp
arable to those caused by the uncertainties of parameters of the $\\Lambda
$CDM model (up to 2.3$\\%$). We investigate the effect of deviations from
$\\Lambda$CDM (minimally and non-minimally coupled dynamical dark energy\,
decaying dark matter) on the evolution of abundances of the first molecul
es.\n\nhttps://indico.cern.ch/event/588228/contributions/2641203/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641203/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Averaging of disturbed Friedmann--Lemaitre cosmological model
DTSTART;VALUE=DATE-TIME:20170925T125000Z
DTEND;VALUE=DATE-TIME:20170925T131000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2629738@indico.cern.ch
DESCRIPTION:Speakers: Krzysztof Głód (Astronomical Observatory of the Ja
giellonian University)\nWe examine a naive perturbative generalization of
the Friedmann--Lemaitre cosmological model. We introduce at the metric lev
el parameters which control basic properties of inhomogeneities\, their pr
ofile\, growth rate and density contrast. We give conditions under which t
he model can be considered reasonable and comment limitations of this appr
oach. Finally\, we perform an averaging procedure of the model using the n
otion of weak limit and propose a method to construct its background model
.\n\nhttps://indico.cern.ch/event/588228/contributions/2629738/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2629738/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Surprising properties of geometric Dirac observables in General Re
lativity
DTSTART;VALUE=DATE-TIME:20170925T095500Z
DTEND;VALUE=DATE-TIME:20170925T101500Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2689077@indico.cern.ch
DESCRIPTION:Speakers: Jerzy Lewandowski (University of Warsaw\, Poland)\nC
oordinates adapted to metric tensor are common tool in many areas of Gener
al Relativity. From the point of view of canonical framework they provide
Dirac observables invariant with respect (ideally) to all or (practically)
to most of diffeomorphisms. Recently\, in that context the coordinates d
efined by geodesics emanating from observer were studied. In the case of t
he space like geodesics the symmetry group is a suitably deformed Poincare
group acting on the space of the metric tensor. In the case of the null g
eodesics the result is surprising for additional reason: the coordinates r
educe the diffeomorphism freedom much more than one could expect. Those pu
blished as well as very recent results will reported.\n\n[1] Symetria Lore
ntza i zdeformowana symetria Poincarego w zakrzywionej czasoprzestrzeni\,
Maciej Kolanowski (Bachelor dissertation)\n\n[2] Observer’s observables.
Residual diffeomorphisms. Paweł Duch\, Jerzy Lewandowski\, Jedrzej Świe
żewski. Class.Quant.Grav. 34 (2017) no.12\, 125009.\n\n[3] The algebra of
observables in Gaußian normal spacetime coordinates. Norbert Bodendorfer
\, Paweł Duch\, Jerzy Lewandowski\, Jędrzej Świeżewski. JHEP 1601 (201
6) 047.\n\n[4] General relativity in the radial gauge: Reduced phase space
and canonical structure. Norbert Bodendorfer\, Jerzy Lewandowski\, Jedrze
j Świeżewski. Phys.Rev. D92 (2015) no.8\, 084041.\n\nhttps://indico.cern
.ch/event/588228/contributions/2689077/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2689077/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark Energy & Modified Gravity in Higher-Order Scalar-Tensor theor
ies
DTSTART;VALUE=DATE-TIME:20170925T091000Z
DTEND;VALUE=DATE-TIME:20170925T095500Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2703767@indico.cern.ch
DESCRIPTION:Speakers: David Langlois (CNRS-Universite Paris Diderot)\nhttp
s://indico.cern.ch/event/588228/contributions/2703767/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2703767/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum gravity and noncommutative space-times
DTSTART;VALUE=DATE-TIME:20170925T103500Z
DTEND;VALUE=DATE-TIME:20170925T110000Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2641062@indico.cern.ch
DESCRIPTION:Speakers: Jerzy Lukierski (University of Wrocław)\nTBA\n\nhtt
ps://indico.cern.ch/event/588228/contributions/2641062/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2641062/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum dynamics of general Bianchi IX model
DTSTART;VALUE=DATE-TIME:20170925T101500Z
DTEND;VALUE=DATE-TIME:20170925T103500Z
DTSTAMP;VALUE=DATE-TIME:20190326T162137Z
UID:indico-contribution-588228-2624961@indico.cern.ch
DESCRIPTION:Speakers: Włodzimierz Piechocki ()\nThe dynamics of the gener
al (non-diagonal) Bianchi IX model\, near the gravitational singularity\
, underlies the BKL scenario. Asymptotically\, the solutions to this dynam
ics include some special structures named wiggles\, which correspond to th
e oscillatory evolution of the BKL scenario. We propose the formalism\, b
ased on the affine quantization scheme\, to examine the fate of the wiggl
es at the quantum level. We present the way of comparing the classical wig
gles with their quantum counterparts. The expectation is that our work may
contribute towards understanding some quantum aspects of the BKL scenario
.\n\nhttps://indico.cern.ch/event/588228/contributions/2624961/
LOCATION:Kazimierz Dolny\, Poland
URL:https://indico.cern.ch/event/588228/contributions/2624961/
END:VEVENT
END:VCALENDAR