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VERSION:2.0
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BEGIN:VEVENT
SUMMARY:Scale invariant extension of the SM with strongly interacting hidd
en sector and dark pion DM (WIMP vs. SIMP)
DTSTART;VALUE=DATE-TIME:20190201T085000Z
DTEND;VALUE=DATE-TIME:20190201T092000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283935@indico.cern.ch
DESCRIPTION:Speakers: Pyungwon Ko ()\nScale invariant extension of the SM
with QCD-like strongly interacting hidden (dark) sector is interesting\, s
ince the dimensional transmutation and chiral symmetry breaking in the hid
den sector could be the origin of electroweak symmetry breaking (EWSB)\,
and all the masses of the SM particles as well as dark pions and dark bary
ons that could be good cold dark matter candidates. In this talk I discus
s dark pion DM as WIMP vs. SIMP. Ignoring the West-Zumio-Witten (WZW) int
eraction\, I first discuss dark pion as a WIMP using two different approac
hes\, the chiral perturbation theory (ChPT) and AdS/QCD. Then I include th
e WZW interaction and discuss dark pion within SIMP scenario. However\,
the analysis based on ChPT indicates that the viable parameter space for S
IMP seems to be outside the validity region of ChPT. I show that this pro
blem can be resolved if we include dark vector mesons\, and the SIMP idea
can be realized in the dark pion sector.\n\nhttps://indico.cern.ch/event/7
40038/contributions/3283935/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283935/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scale Invariance and Symmetries in Inflation
DTSTART;VALUE=DATE-TIME:20190128T142000Z
DTEND;VALUE=DATE-TIME:20190128T150000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283474@indico.cern.ch
DESCRIPTION:Speakers: Jinn-Ouk Gong ()\nhttps://indico.cern.ch/event/74003
8/contributions/3283474/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283474/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scale symmetry\, the Higgs and the cosmos
DTSTART;VALUE=DATE-TIME:20190130T073000Z
DTEND;VALUE=DATE-TIME:20190130T081000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283622@indico.cern.ch
DESCRIPTION:Speakers: Javier Rubio ()\nI will review a scale-invariant ext
ension of the Standard Model and gravity able to support inflation and dar
k energy and containing just an additional degree of freedom on top of the
Standard Model content. This scenario has some interesting features such
as i) the existence of a conserved current that effectively forbids the ge
neration of isocurvature perturbations ii) an alpha-attractor-like solutio
n for the spectral tilt and the tensor-to-scalar ratio\, iii) the absence
of fifth-force effects and iv) a set of consistency relations between the
inflationary and dark energy observables that can be tested with future co
smological observations.\n\nhttps://indico.cern.ch/event/740038/contributi
ons/3283622/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283622/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dimensional Transmutation in Particle Physics and Cosmology
DTSTART;VALUE=DATE-TIME:20190129T073000Z
DTEND;VALUE=DATE-TIME:20190129T081000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283558@indico.cern.ch
DESCRIPTION:Speakers: Alberto Salvio ()\nModels with classical scale invar
iance (CSI) provides us with a dynamical origin for all masses (via dimens
ional transmutation) and can account for all evidence of beyond the standa
rd model physics. Furthermore\, a general theory with CSI is renormalizabl
e (even in the gravity sector) and can solve the hierarchy problem. The pr
ice to pay is a classical ghost. The theory\, however\, admits quantizatio
ns that preserve unitarity and a Hamiltonian bounded from below. The solut
ion of the hierarchy problem implies that the theory can be tested through
inflationary data (indeed it predicts a (gravitational) isocurvature mode
that could be observed in the next future).\n\nI will give an overview of
CSI and introduce the subsequent talks on this subject.\n\nhttps://indico
.cern.ch/event/740038/contributions/3283558/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283558/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Three Scale Invariant Tales
DTSTART;VALUE=DATE-TIME:20190128T131000Z
DTEND;VALUE=DATE-TIME:20190128T135000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283469@indico.cern.ch
DESCRIPTION:Speakers: Eliezer Rabinovici ()\nhttps://indico.cern.ch/event/
740038/contributions/3283469/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283469/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Conformal Realization of the Neutrino Option and its Gravitational
Wave Signature
DTSTART;VALUE=DATE-TIME:20190131T153000Z
DTEND;VALUE=DATE-TIME:20190131T161000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283847@indico.cern.ch
DESCRIPTION:Speakers: Alexander Helmboldt (MPIK Heidelberg)\, Vedran Brdar
(JGU Mainz)\nIt was recently proposed that the electroweak hierarchy prob
lem is absent if the generation of the Higgs potential stems exclusively f
rom quantum effects of heavy right-handed neutrinos which can also generat
e active neutrino masses via the type-I seesaw mechanism. Hence\, in this
framework dubbed the "neutrino option"\, the tree-level scalar potential i
s assumed to vanish at high energies. Such a scenario therefore lends itse
lf particularly well to be embedded in a classically scale-invariant theor
y. In this talk we demonstrate that the minimal scale-invariant framework
compatible with the "neutrino option" requires the Standard Model to be ex
tended by two real scalar singlet fields in addition to right-handed neutr
inos. We present the parameter space of the model for which a phenomenolog
ically viable Higgs potential and neutrino masses are generated\, and for
which all coupling constants remain in the perturbative regime up to the P
lanck scale. In addition\, we show that the phase transition connected wit
h radiative scale symmetry breaking is of strong first order with a subst
antial amount of supercooling. This yields a sizable gravitational wave si
gnal\, so that the model can be fully tested by future gravitational wave
observatories. In particular\, most of the parameter space can already be
probed by the upcoming LIGO science run starting in early 2019.\n\nhttps:/
/indico.cern.ch/event/740038/contributions/3283847/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283847/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scale invariance: super-cooling and Dark Matter
DTSTART;VALUE=DATE-TIME:20190129T142000Z
DTEND;VALUE=DATE-TIME:20190129T150000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3290603@indico.cern.ch
DESCRIPTION:Speakers: Daniele Teresi (Università di Pisa)\, Satoshi Iso (
)\nIf the electroweak sector of the Standard Model is described by classi
cally conformal dynamics\, the early Universe evolution can be substantia
lly altered. In particular\, one generically has a significant period of
super-cooling\, often ended when quark condensates form at the QCD phase
transition. This scenario is potentially rich in cosmological consequence
s\, such as renewed possibilities for electroweak baryogenesis and gravit
ational-wave production. In the second part of the talk we will focus on
Super-cool Dark Matter\, a new mechanism of generation of the cosmologic
al Dark-Matter relic density: super-cooling can easily suppress the amoun
t of Dark Matter down to the desired level. This mechanism generically ta
kes place in old and new scale-invariant models.\n\nhttps://indico.cern.ch
/event/740038/contributions/3290603/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3290603/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A generalized multiple-point (criticality) principle and inflation
DTSTART;VALUE=DATE-TIME:20190201T081000Z
DTEND;VALUE=DATE-TIME:20190201T085000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283934@indico.cern.ch
DESCRIPTION:Speakers: Kin-ya Oda ()\nhttps://indico.cern.ch/event/740038/c
ontributions/3283934/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283934/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black Holes in Higher Derivative Gravity
DTSTART;VALUE=DATE-TIME:20190129T153000Z
DTEND;VALUE=DATE-TIME:20190129T161000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3288147@indico.cern.ch
DESCRIPTION:Speakers: Kellog Stelle ()\nIncluding quadratic curvature term
s in the gravitational action yields a renormalizable theory at the appare
nt cost of instability in the radiation field. One also\nneeds to consider
the effects upon classical solutions such as black holes. All vacuum solu
tions to Einstein’s theory remain good solutions to the higher derivativ
e theory\, so the Schwarzschild family carries over to the generalized the
ory. There are in addition non-Schwarzschild solutions\, however\, crossin
g the Schwarzschild family at a point governed by the Gross-Perry-Yaffe Li
chnerowicz eigenvalue. This crossing point also appears to be a changeover
point \nfor classical stability between the Schwarzschild and non-Schwarz
schild black hole families.\n\nhttps://indico.cern.ch/event/740038/contrib
utions/3288147/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3288147/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Scale Invariance\, Hierarchy generation and Inflation
DTSTART;VALUE=DATE-TIME:20190130T151000Z
DTEND;VALUE=DATE-TIME:20190130T155000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283646@indico.cern.ch
DESCRIPTION:Speakers: Graham Ross ()\nGlobal and local Weyl invariant theo
ries of scalars and gravity can generate all mass scales spontaneously\, i
nitiated by a dynamical process of “inertial spontaneous symmetry brea
king” that does not involve a potential. We discuss how inflation readil
y occurs and how an hierarchy of mass scales may be generated and consid
er its stability against quantum corrections.\n\nhttps://indico.cern.ch/ev
ent/740038/contributions/3283646/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283646/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inertial Weyl Symmetry Breaking\, Dilaton\, and Weyl Photon
DTSTART;VALUE=DATE-TIME:20190130T143000Z
DTEND;VALUE=DATE-TIME:20190130T151000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283645@indico.cern.ch
DESCRIPTION:Speakers: Christopher T. Hill ()\nGlobally Weyl invariant theo
ries have a conserved current that is generally the derivative of a scal
ar. In general expansion\, this scalar flows to a constant\, $K$\, that
serves as the order parameter of symmetry breaking\, eg\, the decay consta
nt of the dilaton is proportional to \\sqrt{K}. If we introduce the Weyl
photon the dilaton is eaten and the photon acquires a mass proportional
to K. The divergence of the Weyl current is the trace anomaly\, and conn
ected to the renormalization group (RG). If the RG is interpreted as flo
w of coupling constants in Weyl invariant ratios\, such as $VEV(phi_i)^2/
K$\, then the Weyl symmetry is maintained at the quantum level.\n\nhttps:/
/indico.cern.ch/event/740038/contributions/3283645/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283645/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scale Invariant Theories of Gravity and the Meaning of the Planck
Mass
DTSTART;VALUE=DATE-TIME:20190131T131000Z
DTEND;VALUE=DATE-TIME:20190131T135000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283831@indico.cern.ch
DESCRIPTION:Speakers: Roberto Percacci ()\nI will review metric-affine the
ories of gravity and the occurrence of a Higgs mechanism that gives mass t
o the gravitational connection. I will then discuss the possibility of ach
ieving quantum scale invariance at high energy in such theories.\n\nhttps
://indico.cern.ch/event/740038/contributions/3283831/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283831/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phenomenological and cosmological implications of hidden scale inv
ariance
DTSTART;VALUE=DATE-TIME:20190131T095000Z
DTEND;VALUE=DATE-TIME:20190131T103000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283698@indico.cern.ch
DESCRIPTION:Speakers: Archil Kobakhidze (The University of Sydney)\nI disc
uss a class of effective low-energy theories that incorporate nonlinearly
realised scale invariance through the dilaton field. Radiatively stable ma
ss hierarchies are realised in a natural (without fine-tuning) way in this
class of models\, with a generic prediction of a light dilaton field. The
cosmological electroweak phase transition in this scenario is triggered b
y the QCD phase transition. This has significant implications for potentia
l gravitational wave signals\, solar masses black holes and generation of
matter-antimatter asymmetry at the QCD scale.\n\nhttps://indico.cern.ch/ev
ent/740038/contributions/3283698/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283698/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Scale Invariance and Weyl Conformal Gravity
DTSTART;VALUE=DATE-TIME:20190130T092000Z
DTEND;VALUE=DATE-TIME:20190130T100000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283626@indico.cern.ch
DESCRIPTION:Speakers: Dumitru Ghilencea ()\nRecent results in (quantum) sc
ale invariance and its spontaneous breaking are presented. In flat spacet
ime\, for a scale invariant theory the scalar potential is presented at
three loops while keeping manifest scale symmetry. This is possible in a
scale-invariant regularization (in $d=4-2\\epsilon$) in which the Goldsto
ne (dilaton) of this symmetry generates (spontaneously) the subtraction sc
ale ($\\mu$). Although non-polynomial (effective) operators are generated
at the quantum level\, suppressed by the (large) dilaton vev\, a classical
hierarchy of vev's (Higgs vs dilaton vev) is quantum stable. In curve
d spacetime\, conformal symmetry and consistency (no ghosts) demands one
introduce the Weyl gauge field $\\omega_\\mu$ (and Weyl conformal geometry
). In the {\\it absence} of matter\, Weyl's (conformal) quadratic gravity
has spontaneous breaking (Stueckelberg mechanism) to Einstein action which
is a "low-energy" effective theory below the mass of $\\omega_\\mu$ (wh
ere the geometry becomes Riemannian). In the {\\it presence} of matter (Hi
ggs) with non-minimal coupling to Weyl gravity\, the breaking of Weyl co
nformal symmetry triggers EW symmetry breaking. (arXiv:1812.08613\, 1809
.09174\, 1712.06024)\n\nhttps://indico.cern.ch/event/740038/contributions/
3283626/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283626/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scale invariance and strong dynamics as the origin of inflation an
d the Planck mass
DTSTART;VALUE=DATE-TIME:20190131T150000Z
DTEND;VALUE=DATE-TIME:20190131T153000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283840@indico.cern.ch
DESCRIPTION:Speakers: Masatoshi Yamada ()\nClassical scale invariance repr
esents a promising framework for model building beyond the Standard Model.
However\, once coupled to gravity\, any scale-invariant microscopic model
requires an explanation for the origin of the Planck scale. In this talk\
, I will present a minimal example for such a mechanism and show how the P
lanck mass can be dynamically generated in a strongly coupled gauge sector
. I will consider the case of hidden SU(N) gauge interactions that link th
e Planck scale to the condensation of a scalar bilinear operator that is n
onminimally coupled to curvature. The effective theory at energies below t
he Planck mass contains two scalar fields: the pseudo-Nambu-Goldstone boso
n of spontaneously broken scale invariance (the dilaton) and a gravitation
al scalar degree of freedom that originates from the R^2 term in the effec
tive action (the scalaron). I will discuss the effective potential for the
coupled dilaton-scalaron system at one-loop order and demonstrate that it
can be used to successfully realize a stage of slow-roll inflation in the
early Universe. Remarkably enough\, our predictions for the primordial sc
alar and tensor power spectra interpolate between those of standard R^2 in
flation and linear chaotic inflation. For comparatively small gravitationa
l couplings\, one thus obtains a spectral index n_s ~= 0.97 and a tensor-t
o-scalar ratio as large as r ~= 0.08.\n\nhttps://indico.cern.ch/event/7400
38/contributions/3283840/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283840/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Continuum clockwork and classical scale invariance
DTSTART;VALUE=DATE-TIME:20190201T131000Z
DTEND;VALUE=DATE-TIME:20190201T135000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283984@indico.cern.ch
DESCRIPTION:Speakers: Sang Hui Im ()\nThe clockwork mechanism provides a
useful picture to understand extra dimensions via continuum limit of the s
cheme (continuum clockwork). The continuum clockwork can find its concrete
realization in the general linear dilaton model (GLD). GLD can be define
d by classical scale invariance in the presence of supersymmetry\, which i
mplies a non-trivial selection rule for radiative corrections to dilaton p
otential. Known examples of GLD are heterotic M-theory\, type II little s
tring theory and non-critical string theories. Previously unexplored Kaluz
a-Klein spectra and couplings can be captured in GLD\, which will be shown
to be actually present in heterotic M-theory.\n\nhttps://indico.cern.ch/e
vent/740038/contributions/3283984/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283984/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Very light dilaton and naturally light Higgs boson
DTSTART;VALUE=DATE-TIME:20190201T123000Z
DTEND;VALUE=DATE-TIME:20190201T131000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283983@indico.cern.ch
DESCRIPTION:Speakers: Deog-Ki Hong ()\nWe study very light dilaton\, arisi
ng from a scale-invariant ultraviolet theory of the Higgs sector in the st
andard model of particle physics. Imposing the scale symmetry below the ul
traviolet scale of the Higgs sector\, we alleviate the fine-tuning problem
associated with the Higgs mass. When the electroweak symmetry is spontane
ously broken radiatively à la Coleman-Weinberg\, the dilaton develops a v
acuum expectation value away from the origin to give an extra contribution
to the Higgs potential so that the Higgs mass becomes naturally around th
e electroweak scale. The ultraviolet scale of the Higgs sector can be ther
efore much higher than the electroweak scale\, as the dilaton drives the H
iggs mass to the electroweak scale. We also show that the light dilaton in
this scenario is a good candidate for dark matter of mass mD∼1 eV−10
keV\, if the ultraviolet scale is about 10−100 TeV. Finally we propose a
dilaton-assisted composite Higgs model to realize our scenario. In additi
on to the light dilaton the model predicts a heavy U(1) axial vector boson
and two massive\, oppositely charged\, pseudo Nambu-Goldstone bosons\, wh
ich might be accessible at LHC.\n\nhttps://indico.cern.ch/event/740038/con
tributions/3283983/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283983/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Making sense of the Nambu-Jona-Lasinio model via scale invariance
DTSTART;VALUE=DATE-TIME:20190201T095000Z
DTEND;VALUE=DATE-TIME:20190201T102000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283936@indico.cern.ch
DESCRIPTION:Speakers: Philip Mannheim ()\nThe status of the chiral-invaria
nt Nambu-Jona-Lasinio (NJL) four-fermi model is quite equivocal. It serves
as the paradigm for dynamical symmetry breaking and yet it is not renorma
lizable. NJL only studied one loop graphs with point vertices\, and needed
to use an ultraviolet cutoff. We propose to dress the point vertices with
scale invariant vertices with anomalous dimensions. We show that if the d
imension of the $\\bar{\\psi}\\psi$ fermion mass operator is reduced from
a canonical three to a dynamical two\, the four fermion interaction become
s renormalizable to all orders in the four-fermion coupling constant. Addi
tionally\, we find that dynamical symmetry breaking then occurs with the f
ermion becoming massive\, and we obtain a dynamical massless pseudoscalar
Goldstone boson and a dynamical scalar Higgs boson. The Higgs boson mass i
s automatically of order the dynamical fermion mass\, with there thus bein
g no hierarchy problem. The Higgs boson automatically has a width\, and th
e width could serve as a diagnostic to distinguish a dynamical Higgs from
an elementary one. We extend the scale invariance to local conformal invar
iance as then coupled to a gravity theory\, conformal gravity\, that is co
nformal too. With Bender and Mannheim having shown that conformal gravity
is a ghost-free\, unitary theory\, it can serve as a consistent theory of
quantum gravity. We show that all of the achievements of supersymmetry can
be achieved by conformal symmetry and conformal gravity instead\, with th
ere then being no need for any new particles at the LHC.\n\nhttps://indico
.cern.ch/event/740038/contributions/3283936/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283936/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Asymptotic Safety and Conformal Standard Model
DTSTART;VALUE=DATE-TIME:20190131T142000Z
DTEND;VALUE=DATE-TIME:20190131T150000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283838@indico.cern.ch
DESCRIPTION:Speakers: Jan Kwapisz ()\nThere are many proposals to extend t
he Standard Model designed to deal with its fundamental inconsistencies. S
ince no new particles have been detected experimentally so far\, the model
s which add only one more scalar particle and possibly right-chiral neutri
nos are favored. One of them is the Conformal Standard Model\, which propo
ses a coherent solution to the Standard Model drawbacks including the hier
archy problem and a dark matter candidate. On the other hand there are sig
ns that gravity is asymptotically safe. If there are no intermediate scale
s between electroweak and Planck scale then the Conformal Standard Model s
upplemented with asymptotically safe gravity can be valid up to arbitraril
y high energies and give a complete description of particle physics phenom
ena. Moreover asymptotic safety hypothesis restricts the mass of the secon
d scalar particle to $300 \\pm 28 $ GeV\, for a_{\\lambda_3} \n\nhttps://i
ndico.cern.ch/event/740038/contributions/3283838/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283838/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fundamental Interactions
DTSTART;VALUE=DATE-TIME:20190131T084000Z
DTEND;VALUE=DATE-TIME:20190131T092000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283696@indico.cern.ch
DESCRIPTION:Speakers: Francesco Sannino ()\nhttps://indico.cern.ch/event/7
40038/contributions/3283696/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283696/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Status and Perspectives of Asymptotic Safety
DTSTART;VALUE=DATE-TIME:20190131T080000Z
DTEND;VALUE=DATE-TIME:20190131T084000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283695@indico.cern.ch
DESCRIPTION:Speakers: Astrid Eichhorn ()\nI will review the key idea under
lying the asymptotic-safety programme both in particle physics as well as
quantum gravity. I will discuss mechanisms that can generate asymptotic sa
fety and will provide an overview of models that could exhibit these mecha
nisms. After reviewing recent developments I will give a short outlook on
future perspectives.\n\nhttps://indico.cern.ch/event/740038/contributions/
3283695/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283695/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Conformal symmetry as an exact symmetry with Higgs mechanism (TH
colloquium)
DTSTART;VALUE=DATE-TIME:20190130T130000Z
DTEND;VALUE=DATE-TIME:20190130T140000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283638@indico.cern.ch
DESCRIPTION:Speakers: Gerard 't Hooft ()\nIn theories such as asymptotical
ly safe gravity\, conformal symmetry is treated as a symmetry for the ultr
a-violet limit of quantum gravity. However\, gravity can be formulated as
a theory where conformal symmetry is exact\, but broken in the same way as
in the Brout-Englert-Higgs-Kibble formalism\, where local gauge symmetry
is still exactly valid but realised in an apparently asymmetric manner. Th
is formally turns gravity into a renormalizable theory\, except for the fa
ct that a physically dubious particle emerges\, a heavy excitation of the
graviton with spin 2 but negative metric. It is not understood what exactl
y the role of such a particle would be\, but it can be pointed out that\,
leaving this mystery as it is\, does produce a scheme that is worth furthe
r study. It generates a system without any tuneable parameters\, so it may
be worth-while to investigate what the coupling parameters of such a theo
ry would be\, and check whether anything physically realistic can be produ
ced. We must have matter added to the system\, and the algebra will have t
o meet with rigorous constraints.\n\nhttps://indico.cern.ch/event/740038/c
ontributions/3283638/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283638/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravity\, Scale Invariance and the Hierarchy Problem
DTSTART;VALUE=DATE-TIME:20190130T100000Z
DTEND;VALUE=DATE-TIME:20190130T103000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283637@indico.cern.ch
DESCRIPTION:Speakers: Andrey Shkerin (EPFL)\nCombining the quantum scale i
nvariance with the absence of new degrees of freedom above the electroweak
scale leads to stability of the latter against perturbative quantum corre
ctions. Nevertheless\, the hierarchy between the weak and the Planck scale
s remains unexplained. We argue that this hierarchy can be generated by a
non-perturbative effect relating the low energy and the Planck-scale physi
cs. The effect is manifested in the existence of an instanton configuratio
n contributing to the vacuum expectation value of the Higgs field. We anal
yze such configurations in several toy models and in a phenomenologically\
nviable theory encompassing the Standard Model and General Relativity in a
scale-invariant way. Dynamical gravity and a non-minimal coupling of it t
o the Higgs field play a crucial role in the mechanism.\n\nhttps://indico.
cern.ch/event/740038/contributions/3283637/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283637/
END:VEVENT
BEGIN:VEVENT
SUMMARY:What do we know about quantum corrections to Higgs Inflation?
DTSTART;VALUE=DATE-TIME:20190130T081000Z
DTEND;VALUE=DATE-TIME:20190130T085000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283624@indico.cern.ch
DESCRIPTION:Speakers: Fedor Bezrukov ()\nhttps://indico.cern.ch/event/7400
38/contributions/3283624/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283624/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the preheating in a scale invariant UV extension of Higgs infla
tion
DTSTART;VALUE=DATE-TIME:20190129T150000Z
DTEND;VALUE=DATE-TIME:20190129T153000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283600@indico.cern.ch
DESCRIPTION:Speakers: Kohei Kamada ()\nHiggs inflation with the nonminimal
coupling to gravity \\xi H^2 R is the unique model \nto realize inflation
driven by the Standard Model Higgs field in a classically scale invariant
way. \nHowever\, the reheating in that model is not understood well yet.\
nIn particular\, in the so-called “non-critical” regime\, it turned ou
t that there are violent instabilities \nin the longitudinal mode at very
high energy scales. \nSince they lie beyond the cutoff scale of the theory
\, it is not clear if they are really physical\, \nand how they affect the
process of reheating if ever. \nIn this talk\, I will point out that by e
xtending the model by adding the classically \nscale invariant R^2 term\,
the model is UV extended so that it becomes possible to analyze the instab
ilities \nwithin the validity of the theory. For stronger R^2 term\, I sho
w that the instability gradually disappear. \nI will clarify if there are
some parameter spaces where the instabilities still remain below the cutof
f scale \nand the instabilities are really physical. I also discuss how th
e reheating will proceed.\n\nhttps://indico.cern.ch/event/740038/contribut
ions/3283600/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283600/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A ghost and a naked singularity: facing our demons
DTSTART;VALUE=DATE-TIME:20190129T131000Z
DTEND;VALUE=DATE-TIME:20190129T135000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283592@indico.cern.ch
DESCRIPTION:Speakers: Bob Holdom ()\nWe encounter these demons on the path
towards a UV complete QFT of gravity and a horizonless replacement for bl
ack holes. The fate of the ghost and related issues are discussed in the s
trong coupling version of classically scale invariant quadratic gravity. W
e compare this story to QCD. The 2-2-hole solutions appearing in a classic
al approximation of the gravity theory are then discussed\, along with som
e new results. The timelike singularity is shrouded by a fireball and thor
ny issues of black hole horizons are avoided. Observable consequences migh
t even lurk in present LIGO data.\n\nhttps://indico.cern.ch/event/740038/c
ontributions/3283592/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283592/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Conformal extensions of the Standard Model
DTSTART;VALUE=DATE-TIME:20190129T123000Z
DTEND;VALUE=DATE-TIME:20190129T131000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283582@indico.cern.ch
DESCRIPTION:Speakers: Manfred Lindner (Max Planck Institut fuer Kernphysik
\, Heidelberg\, Germany)\nhttps://indico.cern.ch/event/740038/contribution
s/3283582/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283582/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fakeons\, quantum gravity and the classical limit
DTSTART;VALUE=DATE-TIME:20190129T095000Z
DTEND;VALUE=DATE-TIME:20190129T102000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283578@indico.cern.ch
DESCRIPTION:Speakers: Damiano Anselmi ()\nA new quantization prescription
is able to endow quantum field theory with a new type of "particle"\, the
fakeon (fake particle)\, which mediates interactions\, but cannot be obser
ved. A massive fakeon of spin 2 (together with a scalar field) allows us t
o build a theory of quantum gravity that is both renormalizable and unitar
y\, and to some extent unique. After presenting the general properties of
this theory\, I discuss its classical limit\, which carries important remn
ants of the fakeon quantization prescription.\n\nhttps://indico.cern.ch/ev
ent/740038/contributions/3283578/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283578/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spontaneous Breaking of Restricted Weyl Symmetry in Pure R^2 Gravi
ty
DTSTART;VALUE=DATE-TIME:20190129T092000Z
DTEND;VALUE=DATE-TIME:20190129T095000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283567@indico.cern.ch
DESCRIPTION:Speakers: Ariel Edery ()\nRecent work has shown that pure R^2
gravity (i.e. R^2 gravity with no extra R term) has a symmetry that is lar
ger than scale symmetry and smaller than full Weyl symmetry. This has been
dubbed restricted Weyl symmetry as it involves a Weyl transformation wh
ere the conformal factor has a constraint. Most importantly\, this symmet
ry is spontaneously broken when the vacuum (background spacetime) has a no
n-zero Ricci scalar. In this case\, the theory can be shown to be equivale
nt to Einstein gravity with non-zero cosmological constant and a massless
scalar field. The massless scalar field is identified as the Goldstone bos
on of the broken sector. In spontaneously broken theories\, the original s
ymmetry of the Lagrangian is realized as a shift symmetry of the Goldstone
bosons. We show that this is the case also here. The unbroken R=0 sector
is completely different and has no connection to Einstein gravity.\n\nhttp
s://indico.cern.ch/event/740038/contributions/3283567/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283567/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gauge Assisted Quadratic Gravity
DTSTART;VALUE=DATE-TIME:20190129T081000Z
DTEND;VALUE=DATE-TIME:20190129T085000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283565@indico.cern.ch
DESCRIPTION:Speakers: John Donoghue ()\nIn work with Gabriel Menezes\, we
are exploring the use of quantum field theory for quantum gravity at all s
cales. Starting from a scale invariant action\, our variant uses an extra
Yang-Mills gauge interaction to induce the Einstein action in such a way t
hat gravity is kept weakly coupled at all scales. We have explored the unu
sual field theoretic aspects of this theory\, and so far have promising re
sults.\n\nhttps://indico.cern.ch/event/740038/contributions/3283565/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283565/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a Scale Invariant Theory of Gravity
DTSTART;VALUE=DATE-TIME:20190128T153000Z
DTEND;VALUE=DATE-TIME:20190128T160000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283499@indico.cern.ch
DESCRIPTION:Speakers: Anupam Mazumdar ()\nI will discuss some of the recen
t results obtained in ghost free infinite derivative theory of gravity\, w
hich suggests towards scale invariant\, conformally flat for static and ro
tating non-singular metric solutions at both linear and non-linear level.
From quantum perspective such class of theory provides a new scale in the
infrared which points towards transmutation of scales from ultraviolet to
infrared. Based on these results I will discuss further conjectures that a
strophysical blackholes can be mimicked by non local stars puffed up sligh
tly larger than the horizon scale\, such that information loss paradox can
be ameliorated.\n\nhttps://indico.cern.ch/event/740038/contributions/3283
499/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283499/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Building a viable asymptotically safe SM
DTSTART;VALUE=DATE-TIME:20190128T150000Z
DTEND;VALUE=DATE-TIME:20190128T153000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283487@indico.cern.ch
DESCRIPTION:Speakers: Steven Abel ()\nI report on recent work to embed the
Standard Model within an asymptotically safe framework. This approach\,
which is based on gauge-Yukawa theories with interacting UV fixed points\,
focusses on providing a field theoretical UV completion to the SM along w
ith radiative symmetry breaking. The framework yields several generic pred
ictions.\n\nhttps://indico.cern.ch/event/740038/contributions/3283487/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283487/
END:VEVENT
BEGIN:VEVENT
SUMMARY:K(E10) and Standard Model Fermions
DTSTART;VALUE=DATE-TIME:20190128T123000Z
DTEND;VALUE=DATE-TIME:20190128T131000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283452@indico.cern.ch
DESCRIPTION:Speakers: Hermann Nicolai ()\nIn this talk I will describe an
attempt to understand the\nfermion spectrum of the Standard Model (with th
ree generations of quarks\nand leptons\, and no "extra baggage") from a mo
re fundamental theory. One interesting possible consequence of this scheme
is the emergence of new super-heavy dark matter candidates.\n\nhttps://in
dico.cern.ch/event/740038/contributions/3283452/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283452/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scale Invariance and its Breaking in Cosmology
DTSTART;VALUE=DATE-TIME:20190128T085000Z
DTEND;VALUE=DATE-TIME:20190128T092000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283450@indico.cern.ch
DESCRIPTION:Speakers: Elias Kiritsis ()\nHolographic ideas are used to set
-up cosmology along the Wilsonian paradigm. Cosmological solutions are inv
estigated\, and the connection between de Sitter and Anti de Sitter regime
s in the supergravity landscape is probed.\n\nhttps://indico.cern.ch/event
/740038/contributions/3283450/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283450/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Scale Symmetry
DTSTART;VALUE=DATE-TIME:20190128T081000Z
DTEND;VALUE=DATE-TIME:20190128T085000Z
DTSTAMP;VALUE=DATE-TIME:20200225T164314Z
UID:indico-contribution-740038-3283449@indico.cern.ch
DESCRIPTION:Speakers: Wetterich Christof ()\nQuantum scale symmetry is the
realization of scale invariance in a quantum field theory. No parameters
with dimension of length or mass are present in the quantum effective acti
on. Quantum scale symmetry is generated by quantum fluctuations via the pr
esence of fixed points for running couplings. As for any global symmetry\,
the ground state or cosmological state may be scale invariant or not. Spo
ntaneous breaking of scale symmetry leads to massive particles and predict
s a massless Goldstone boson. A massless particle spectrum follows from sc
ale symmetry of the effective action only if the ground state is scale sym
metric. Approximate scale symmetry close to a fixed point leads to importa
nt consequences for observations in various areas of fundamental physics.\
nWe review consequences of scale symmetry for particle physics\, quantum g
ravity and cosmology. For particle physics\, scale symmetry is closely lin
ked to the tiny ratio between the Fermi scale of weak interactions and the
Planck scale for gravity. For quantum gravity\, scale symmetry is associa
ted to the ultraviolet fixed point which allows for a non-perturbatively r
enormalizable quantum field theory for all known interactions. The interpl
ay between gravity and particle physics at this fixed point permits to pre
dict couplings of the standard model or other ``effective low energy model
s'' for momenta below the Planck mass. In particular\, quantum gravity det
ermines the ratio of Higgs boson mass and top quark mass. In cosmology\, a
pproximate scale symmetry explains the almost scale-invariant primordial f
luctuation spectrum which is at the origin of all structures in the univer
se. The pseudo-Goldstone boson of spontaneously broken approximate scale s
ymmetry may be responsible for dynamical dark energy and a solution of the
cosmological constant problem.\n\nhttps://indico.cern.ch/event/740038/con
tributions/3283449/
LOCATION:CERN 4/3-006 - TH Conference Room
URL:https://indico.cern.ch/event/740038/contributions/3283449/
END:VEVENT
END:VCALENDAR