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BEGIN:VEVENT
SUMMARY:Stabilizing the EW vacuum
DTSTART;VALUE=DATE-TIME:20190613T071500Z
DTEND;VALUE=DATE-TIME:20190613T080500Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94822@agenda.infn.it
DESCRIPTION:Speakers: Vincenzo Branchina (CT)\nAlthough the electroweak va
cuum is not absolutely stable\, when only Standard Model interactions are
considered its lifetime T turns out to be much larger than the age of the
Universe. However\, T is extremely sensitive to the\npresence of unknown h
igh energy new physics: the latter can enormously lower T. This poses a se
rious problem for the stability of our Universe. In this talk I discuss ph
ysical mechanisms that "naturally" stabilize the electroweak vacuum.\nhttp
s://agenda.infn.it/event/18114/contributions/94822/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94822/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Compton-Schwarzschild correspondence: primordial black holes a
s the link between microphysics and macrophysics
DTSTART;VALUE=DATE-TIME:20190613T081000Z
DTEND;VALUE=DATE-TIME:20190613T090000Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94823@agenda.infn.it
DESCRIPTION:Speakers: Bernard Carr (Queen Mary University of London)\nBlac
k holes could span 60 decades of mass - from the Planck scale (10-5g) to t
he cosmological scale (1022Mo) - and therefore provide an important link b
etween microphysics and macrophysics. In the macroscopic domain\, attentio
n has recently turned to the possibility that primordial black holes (i.e.
those formed in the early universe) could provide the dark matter or the
black-hole mergers detected by LIGO or even some features of cosmic struct
ure. In the microscopic domain\, primordial black holes lighter than the E
arth would have a Hawking temperature exceeding that of the cosmic microwa
ve background\, so that quantum effects are important. Such quantum black
holes span the lower 30 decades of mass and provide a unique probe of the
early universe and high energy physics. The micro-macro link is most strik
ing at the Planck scale\, with Planckian black holes likely to play a key
role in quantum gravity. This raises the question of what happens to relat
ivity theory as one approaches the Planck scale from above (eg. the Schwar
zschild radius) and to quantum theory as one approaches it from below (eg.
the Compton radius). It is argued that there should be a smooth transitio
n between these two scales\, corresponding to a unified Compton-Schwarzsch
ild expression. In this case\, there may also be a link between elementary
particles and sub-Planckian black holes and the Hawking temperature shoul
d increase with mass in the sub-Planckian regime\, leading to the possibil
ity that stable black hole relics provide the dark matter. It is also argu
ed that the duality between the Compton and Schwarzschild scales should be
maintained if the number of spatial dimensions increases\, which has impo
rtant implications for the observability of black holes in accelerators.\n
https://agenda.infn.it/event/18114/contributions/94823/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94823/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phenomenology of scale-invariant gravity
DTSTART;VALUE=DATE-TIME:20190613T100500Z
DTEND;VALUE=DATE-TIME:20190613T103000Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94825@agenda.infn.it
DESCRIPTION:Speakers: Massimiliano Rinaldi (TIFP)\nIn this talk we discuss
the possibility that tensor-scalar gravity is naturally scale-invariant\,
at least at the classical level. This assumption has a number of phenomen
ological consequences on the physics of the Universe at large scale and of
black holes. We consider some of these to assess whether scale-invariance
is a viable and fundamental symmetry.\nhttps://agenda.infn.it/event/18114
/contributions/94825/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94825/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effective field theories for cosmological fluids\, solids and supe
rsolids
DTSTART;VALUE=DATE-TIME:20190613T123000Z
DTEND;VALUE=DATE-TIME:20190613T132000Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94828@agenda.infn.it
DESCRIPTION:Speakers: Marco Celoria (GSSI and ICTP)\nI will review some co
smological applications of the effective field theories for condensed matt
er systems\, characterised by the spontaneous symmetry breaking for spacet
ime symmetries. The associated Goldstone bosons represent the low-energy e
xcitations\, the phonons\, of self-gravitating media (such as solids\, flu
ids\, superfluids and supersolids). Such an effective approach can be used
to give a very general modelling of the dark sector based on symmetries\,
possibly explaining the accelerated expansion of the Universe.\nhttps://a
genda.infn.it/event/18114/contributions/94828/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94828/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Shadow of the Supermassive Black Hole M87
DTSTART;VALUE=DATE-TIME:20190613T133000Z
DTEND;VALUE=DATE-TIME:20190613T142000Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94829@agenda.infn.it
DESCRIPTION:Speakers: Mariafelicia De Laurentis (Napoli University and INF
N)\nhttps://agenda.infn.it/event/18114/contributions/94829/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94829/
END:VEVENT
BEGIN:VEVENT
SUMMARY:CMB lensing beyond the leading order: is there a new physical effe
ct in E- and B-modes power spectra?
DTSTART;VALUE=DATE-TIME:20190614T070000Z
DTEND;VALUE=DATE-TIME:20190614T075000Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94830@agenda.infn.it
DESCRIPTION:Speakers: Giovanni Marozzi (Pisa University and INFN)\nIn this
talk\, I will present the weak lensing correction\, to the cosmic microwa
ve background temperature\nand polarization anisotropies\, including all t
he effects that go beyond the leading order. These are: post-Born correct
ions\, LSS corrections and\, for the polarization anisotropies\, the corre
ction due to the rotation of the polarization direction between the emissi
on at the source and the detection at the observer. I will then concentrat
e on the effect coming from the rotation of the polarisation direction\, s
howing how this is a true physical effect\, which has to be taken into acc
ount at second order in perturbation theory\, and clarifying inconsistenci
es on the treatment of this rotation in the recent literature. To conclude
\, focusing on B-mode power spectrum\, I will consider the magnitude of th
is effect and discuss the reason because this has to be taken in considera
tion in future CMB survey\, that aim to measure a tensor-to-scalar ratio o
f the order of 0.001.\nhttps://agenda.infn.it/event/18114/contributions/94
830/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94830/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Binary Neutron Star Mergers: Numerical Simulations and Observation
DTSTART;VALUE=DATE-TIME:20190614T123000Z
DTEND;VALUE=DATE-TIME:20190614T132000Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94832@agenda.infn.it
DESCRIPTION:Speakers: Bruno Giacomazzo (TIFP)\nI will review the current s
tate of the art of fully general\nrelativistic numerical simulations of bi
nary neutron star mergers. I will focus in particular on what we can learn
from the gravitational wave and electromagnetic emission. These sources e
mit indeed strong gravitational waves and power bright electromagnetic sig
nals that are strongly correlated with the properties of matter and spacet
ime in a strong-gravity regime. I will also describe how observations of t
hese systems match theoretical predictions and how they can be used to pro
vide further information on cosmological\nparameters and alternative theor
ies of gravity.\nhttps://agenda.infn.it/event/18114/contributions/94832/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94832/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Homogeneous and Inhomogeneous full-GR cosmological dynamics
DTSTART;VALUE=DATE-TIME:20190614T133000Z
DTEND;VALUE=DATE-TIME:20190614T142000Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94833@agenda.infn.it
DESCRIPTION:Speakers: Marco Bruni (Portsmouth University)\nIn this talk I
will first describe results from cosmological simulations in the nonlinear
post-Friedman approximation\, a kind of post-Newtonian formalism for cosm
ology\, showing how gravito-magnetic effects are produced by structure for
mation. Then I will focus on recent fully nonlinear numerical relativity
simulations representing the evolution of initial perturbations in a Eins
tein de Sitter background. Main results are: 1) back-reaction effects o
n the overall expansion of the model are very small\; 2) voids expansion r
ate is significantly higher than that of the background\; 3) over-densitie
s can reach turn-around later than predicted by the standard top-hat mode
l. I will end the talk with some more speculative work on homogenous Bianc
hi IX models that can be taken to represent the most general spatial avera
ge of the universe: using a nonlinear equations of state and anisotropic s
tress we show that Einstein equations admit bouncing (nonsingular) solutio
ns where the typical Bianchi IX chaos and anisotropies are suppressed. In
this scenario\, therefore\, the isotropic universe in which we live is the
results of the dynamics. To establish the significance of these results
is the goal of future work.\nhttps://agenda.infn.it/event/18114/contribut
ions/94833/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94833/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hyperbolic vacuum decay
DTSTART;VALUE=DATE-TIME:20190613T160000Z
DTEND;VALUE=DATE-TIME:20190613T162500Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94839@agenda.infn.it
DESCRIPTION:Speakers: Hristu Culetu (Ovidius University)\nThe properties o
f an hyperbolically-expanding wormhole are studied. Using a particular equ
ation of state for the fluid on the wormhole throat\, we reached an equati
on of motion for the throat that leads to a constant surface energy densit
y σ. The Lagrangean leading to the above equation of motion contains the
”rest mass” of the expanding particle as a potential energy. The assoc
iated Hamiltonian corresponds to a relativistic free par- ticle of a total
Planck energy EP . From the energy constraint we obtained that the cosmol
ogical constant is of Planck order but hidden at very tiny scales\, in acc
ordance with Carlip’s recipe.\nhttps://agenda.infn.it/event/18114/contri
butions/94839/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94839/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Time in quantum theory\, the Wheeler-DeWitt equation and the Born-
Oppenheimer approximation
DTSTART;VALUE=DATE-TIME:20190614T093000Z
DTEND;VALUE=DATE-TIME:20190614T095500Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94834@agenda.infn.it
DESCRIPTION:Speakers: Tereza Vardanyan (BO)\nWe compare two different appr
oaches to the treatment of the Wheeler-DeWitt equation and the introductio
n of time in quantum cosmology. One approach is based on the gauge-fixing
procedure in theories with first-class constraints\, while the other uses
the Born-Oppenheimer method. We apply both to a very simple cosmological m
odel and observe that they give similar predictions. We also discuss the p
roblem of time in non-relativistic quantum mechanics and some questions co
ncerning the correspondence between classical and quantum theories.\nhttps
://agenda.infn.it/event/18114/contributions/94834/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94834/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bootstrapping Newtonian gravity
DTSTART;VALUE=DATE-TIME:20190614T150000Z
DTEND;VALUE=DATE-TIME:20190614T152500Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94836@agenda.infn.it
DESCRIPTION:Speakers: Michele Lenzi (B)\nhttps://agenda.infn.it/event/1811
4/contributions/94836/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94836/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Some features of the Hamiltonian Analysis of Asymptotic Safe Quant
um Gravity
DTSTART;VALUE=DATE-TIME:20190613T093500Z
DTEND;VALUE=DATE-TIME:20190613T100000Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94824@agenda.infn.it
DESCRIPTION:Speakers: Gabriele Gionti (Specola Vaticana)\nAfter a brief in
troduction to the basic ideas underlying Asymptotic Safety\, we analize a
RG improved Einstein-Hilbert Lagrangian in which the cosmological constant
and the gravitational constant are non geometrical fields\, functions of
the Space-Time and determined by the Renormalization Group. The main goal
of this Hamiltonian analysis is to probe the vacuum of Asymptotic Safety.
This Hamiltonian theory exibits non trivial Dirac's constraints which\, de
spite Einstein General Relativity\, are second class due to the breaking o
f diff-invariance by $G(x)$ and $\\Lambda(x)$. To throw light on this comp
licated scenario\, the parent Brans-Dicke theory is analyzed. Its Dirac’
s constraint analysis has first class constraints which are not equivalent
to Einstein’s General Relativity. Its Dirac’s constraint algebra\, co
ntrary to some claims in the litterature\, does not reduce to Einstein Gen
eral Relativity algebra. In general it is believed that Brans-Dicke theory
is equivalent to Einstein General Relativity by passing from the Jordan F
rame to the Einstein Frame. We prove this transformation is not canonical
and generates two inequivalent Hamiltonian theories and then two inequival
ent quantum theories.\nhttps://agenda.infn.it/event/18114/contributions/94
824/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94824/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Time-energy uncertainty relation for neutrino oscillations in curv
ed spacetime
DTSTART;VALUE=DATE-TIME:20190613T150000Z
DTEND;VALUE=DATE-TIME:20190613T152500Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94826@agenda.infn.it
DESCRIPTION:Speakers: Luca Smaldone (Istituto Nazionale di Fisica Nucleare
)\nWe derive the Mandelstam-Tamm time-energy uncertainty relation for neut
rino oscillations in a generic stationary curved spacetime. In particular\
, by resorting to Stodolsky covariant formula of the quantum mechanical ph
ase\, we estimate gravity effects on the neutrino energy uncertainty. Devi
ations from the standard Minkowski result are explicitly evaluated in Schw
arzschild\, Lense-Thirring and Rindler (uniformly accelerated) geometries.
Finally\, we discuss how spacetime could affect the characteristic neutri
no oscillation length in connection with the recent view of flavor neutrin
os as unstable particles.\nhttps://agenda.infn.it/event/18114/contribution
s/94826/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94826/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Turnaround size of non-spherical structures
DTSTART;VALUE=DATE-TIME:20190613T153000Z
DTEND;VALUE=DATE-TIME:20190613T155500Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94827@agenda.infn.it
DESCRIPTION:Speakers: Andrea Giusti (Bishop University)\nThe turnaround ra
dius of a large structure in an accelerating universe has been studied onl
y for spherical structures\, while real astronomical systems deviate from
spherical symmetry. We show that\, for small deviations from spherical sym
metry\, the gauge-invariant characterization of the turnaround size using
the Hawking-Hayward quasi-local mass and spherical symmetry still applies\
, to first order in the cosmological perturbation potentials and in the de
viations from sphericity. This is the first step to include non-spherical
systems in the physics of turnaround.\nhttps://agenda.infn.it/event/18114/
contributions/94827/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94827/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Characterizing black hole metrics in quadratic gravity
DTSTART;VALUE=DATE-TIME:20190614T153000Z
DTEND;VALUE=DATE-TIME:20190614T155500Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94837@agenda.infn.it
DESCRIPTION:Speakers: Samuele Silveravalle (Milano University )\nThe recen
t discovery of non-Schwarzschild black hole spacetimes has opened new dire
ctions of research in higher-derivative gravitational theories. However\,
despite intense analytical and numerical efforts\, the link with the linea
rized theory is still poorly understood. In this work we address this poin
t for the Einstein-Weyl Lagrangian\, whose weak field limit is characteriz
ed by the standard massless graviton and a spin-2 ghost. We show that the
strength of the Yukawa term at infinity determines the thermal properties
of the black hole and the structure of the singularity near r = 0. Moreove
r\, inspired by recent results in the Asymptotic Safety scenario we invest
igate the consequences of an imaginary ghost mass. In this case we find a
countable set of solutions all characterized by spatial oscillations of ty
pical wavelength determined by the mass of the spin-2 field.\nhttps://agen
da.infn.it/event/18114/contributions/94837/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94837/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Duality between static spherically or hyperbolically symmetric sol
utions and cosmological solutions in scalar-tensor gravity
DTSTART;VALUE=DATE-TIME:20190614T080000Z
DTEND;VALUE=DATE-TIME:20190614T082500Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-95023@agenda.infn.it
DESCRIPTION:Speakers: Alexander Kamenshchik (BO)\nWe study static spherica
lly and hyperbolically symmetric solutions of the Einstein equations in th
e presence of a conformally coupled scalar field and compare them with tho
se in the space filled with a minimally coupled scalar field. We then stud
y the Kantowski-Sachs cosmological solutions\, which are connected with th
e static solutions by the duality relations. The main ingredient of these
relations is an exchange of roles between the radial and the temporal coor
dinates\, combined with the exchange between the spherical and hyperbolica
l two-dimensional geometries. A brief discussion of questions such as the
relation between the Jordan and the Einstein frames and the description of
the singularity crossing is also presented.\nhttps://agenda.infn.it/event
/18114/contributions/95023/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/95023/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Is the standard Higgs just a simple massive field?
DTSTART;VALUE=DATE-TIME:20190614T160000Z
DTEND;VALUE=DATE-TIME:20190614T162500Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94838@agenda.infn.it
DESCRIPTION:Speakers: Maurizio Consoli (CT)\nA recent re-analysis of the A
TLAS and CMS data indicates a sizeable excess of events in the 4 leptons\n
channel\, for a total invariant mass around 700 GeV. Its natural interpret
ation is in terms of a new scalar boson which decays into ZZ and then into
(l+l-)(l+l-) charged final states. I will argue that this picture might h
ave an intriguing relation with the other 125 GeV scalar particle which\,
so far\, has been identified as the fundamental Higgs boson. The relation
is based on both numerical and analytical evidence that\, in the broken-sy
mmetry phase\, the scalar propagator is more complicated than usually expe
cted\, as if there were a 2-pole structure. I will show that\, in this per
spective\, the existence of a pair of states\, respectively at 125 and 750
GeV\, would not be completely unexpected.\nhttps://agenda.infn.it/event/1
8114/contributions/94838/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94838/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stochastic gravitational waves background and its anisotropies
DTSTART;VALUE=DATE-TIME:20190614T100000Z
DTEND;VALUE=DATE-TIME:20190614T102500Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-94835@agenda.infn.it
DESCRIPTION:Speakers: Mairi Sakelariadu (King's College London)\nThe direc
t detections of Gravitational Waves (GWs) by the Advanced LIGO and Advance
d Virgo interferometers have opened a new era of astronomy. Aside the curr
ent detections associated with individual loud events\, one expects a supe
rposition of coincident unresolved events leading to a stochastic GW backg
round (SGWB). After reviewing briefly the SGWB\, I will discuss how the an
isotropic distribution of sources and the inhomogeneous geometry of the in
tervening spacetime can induce anisotropies. I will consider a SGWB produ
ced by (1) cosmic strings and (2) by compact binary coalescences. I will s
how that while the SGWB monopole is sensitive to the particular model one
uses\, the anisotropic angular power spectrum is basically insensitive to
the cosmic string model or the nature of binary black holes population. I
will then discuss the noise in the anisotropies of the astrophysical GW ba
ckground sourced by the finite sampling of both the galaxy distribution an
d the compact binary coalescence event rate.\nhttps://agenda.infn.it/event
/18114/contributions/94835/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/94835/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Opening
DTSTART;VALUE=DATE-TIME:20190613T070000Z
DTEND;VALUE=DATE-TIME:20190613T071500Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-95249@agenda.infn.it
DESCRIPTION:https://agenda.infn.it/event/18114/contributions/95249/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/95249/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Compact binary coalescences: Constraints on waveforms
DTSTART;VALUE=DATE-TIME:20190614T083000Z
DTEND;VALUE=DATE-TIME:20190614T085500Z
DTSTAMP;VALUE=DATE-TIME:20211021T051600Z
UID:indico-contribution-95972@agenda.infn.it
DESCRIPTION:Speakers: Tommaso De Lorenzo (Penn State University)\nTo obtai
n gravitational waveforms\, results of analytical approximations for the e
arly phase of compact binary coalescences are ‘stitched’ with –or ca
librated against– numerical simulations for the late phase. Each of thes
e calculations requires external inputs and there are additional ambiguiti
es associated with the stitching procedure. Nonetheless\, the resulting wa
veforms have been invaluable for the initial detections by the LIGO-Virgo
collaboration. We are now entering an era of abundant detections\, requiri
ng greater theoretical precision not only for a better estimation of sourc
e parameters assuming general relativity (GR)\, but also for testing GR it
self using gravitational waves data. In this talk I will show that full no
n-linear GR imposes an infinite number of sharp constraints on the CBC wav
eforms which can be used as clear-cut measures (i) to evaluate the accurac
y of any waveform in the template bank against exact GR\, and (ii) to disc
riminate between various choices that have to be made to resolve the ambig
uities.\nhttps://agenda.infn.it/event/18114/contributions/95972/
LOCATION:Museo Diocesano (Catania)
URL:https://agenda.infn.it/event/18114/contributions/95972/
END:VEVENT
END:VCALENDAR