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BEGIN:VEVENT
SUMMARY:Tensions in cosmological measurements: a Standard Model crisis?
DTSTART;VALUE=DATE-TIME:20191118T133000Z
DTEND;VALUE=DATE-TIME:20191118T153000Z
DTSTAMP;VALUE=DATE-TIME:20191214T015100Z
UID:indico-event-20760@agenda.infn.it
DESCRIPTION:Speakers: Guido Risaliti (UNIFI)\nThe so-called “concordance
” cosmological model has been the cornerstone of observational cosmology
. Even if it is based on components of unknown physical origin (inflation\
, dark matter\, the cosmological constant) its agreement with an impressiv
e set of independent observational measurements made it quite successful
for many years. However\, recently several new observations posed a seri
ous challenge to this model: a more than 4 sigma difference between the me
asured value of the Hubble constant and its predicted value based on CMB d
ata\, a deviation between the observed and predicted expansion of the Univ
erse at high redshift\, and a tension between the most recent Planck CMB d
ata and the hypothesis of flatness. I will review the main observational d
ata supporting the standard scenario\, and I will discuss these recent ten
sions\, and possible solutions beyond the “concordance” model.\nhttps:
//agenda.infn.it/event/20760/
LOCATION:Room 281 (Dipartimento di Fisica e Astronomia\, Firenze)
URL:https://agenda.infn.it/event/20760/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite-density QCD transition in magnetic field background
DTSTART;VALUE=DATE-TIME:20191121T133000Z
DTEND;VALUE=DATE-TIME:20191121T143000Z
DTSTAMP;VALUE=DATE-TIME:20191214T015100Z
UID:indico-event-19908@agenda.infn.it
DESCRIPTION:Speakers: Andrey Kotov (Institute for Theoretical and Experime
ntal Physics)\nIn this talk we discuss the influence of magnetic-field bac
kground on chiral and deconfinement crossovers in finite-temperature QCD a
t low\n\nbaryonic density. To address this problem we perform numerical si
mulation of lattice QCD with 2+1 physical quark masses at nonzero\n\ntempe
rature\, magnetic field and imaginary chemical potential. Results for real
values of chemical potential are obtained by means of\n\nanalytical conti
nuation. In the absence of thermodynamic singularity\, we identify the pha
se transitions with inflection points of the\n\napproximate order paramete
rs: normalized light-quark condensate and renormalized Polyakov loop\, res
pectively.\n\nWe show that the quadratic curvature of the chiral transitio
n temperature in the temperature-chemical potential plane depends rather w
eakly\n\non the strength of the background magnetic field. At weak magneti
c fields\, the thermal width of the chiral crossover gets narrower as the\
n\ndensity of the baryon matter increases\, possibly indicating a proximit
y to a real thermodynamic phase transition. Remarkably\, the curvature\n\n
of the chiral thermal width flips its sign at $eB_{\\text{fl}} \\simeq 0.6
\\\,\\mathrm{GeV}^2$\, so that above the flipping point $B >\n\nB_{\\text{
fl}}$\, the chiral width gets wider as the baryon density increases. Appro
ximately at the same strength of magnetic field\, the\n\nchiral and deconf
ining crossovers merge together at $T \\approx 140\\\,\\mathrm{MeV}$. The
phase diagram in the parameter space\n\ntemperature-chemical potential-mag
netic field is outlined.\n\n \n\nThe talk is based on the paper arXiv:190
9.09547.\nhttps://agenda.infn.it/event/19908/
LOCATION:
URL:https://agenda.infn.it/event/19908/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Partial Compositeness from Partial Unification
DTSTART;VALUE=DATE-TIME:20191125T133000Z
DTEND;VALUE=DATE-TIME:20191125T143000Z
DTSTAMP;VALUE=DATE-TIME:20191214T015100Z
UID:indico-event-20954@agenda.infn.it
DESCRIPTION:Speakers: Chen Zhang (Physics Division\, National Center for T
heoretical Sciences\, Hsinchu\, Taiwan )\nWe made an attempt at UV-complet
ing a class of composite Higgs models based on partial compositeness in fo
ur-dimensional spacetime. These composite Higgs models feature a set of hy
perfermions charged under a new confining gauge group called hypercolor. P
artial compositeness is realized via four-fermion operators composed of on
e SM fermion and three hyperfermions. Focusing on the third family alone\,
we find it is possible to construct an anomaly-free UV completion of a co
mposite Higgs model based on Sp(4) hypercolor group by partially unifying
the SM color and hypercolor groups\, which has the potential to explain th
e mass hierarchies inside the third family (including the neutrino). With
a nontrivial extension we find the model also has the potential to generat
e masses for the first and second family SM fermions. However\, suppressio
n of unwanted flavor and CP violation remains the main open issue.\nhttps:
//agenda.infn.it/event/20954/
LOCATION:
URL:https://agenda.infn.it/event/20954/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zubarev density operator as a source of Unruh Effect and emergent
conical geometry
DTSTART;VALUE=DATE-TIME:20191126T133000Z
DTEND;VALUE=DATE-TIME:20191126T153000Z
DTSTAMP;VALUE=DATE-TIME:20191214T015100Z
UID:indico-event-20968@agenda.infn.it
DESCRIPTION:Speakers: George Prokhorov (JINR Dubna\, Russia)\nIt is shown
that quantum corrections in acceleration calculated on the basis of the Zu
barev density operator allow us to substantiate the\n\nexistence of the Un
ruh effect from the point of view of quantum statistical mechanics. A wide
class of theories of free fields is\n\nconsidered: real and complex scala
r fields\, Dirac field. Both massless and massive cases are investigated.
In the case of bosonic fields\,\n\ninfrared divergences arise\; a consiste
nt method for their regularization is proposed. The calculated corrections
exactly correspond to\n\nthe quantum corrections to the vacuum value of t
he energy-momentum tensor in space-time with a conical singularity\, such
as cosmic\n\nstring. Thus\, we establish the existence of exact duality be
tween the Zubarev approach and the theory with a conical singularity\, or
the\n\nexistence of the emergent conical geometry in the approach with the
density operator. A comparison of the corrections calculated by two\n\nme
thods allows us to predict the absence of higher-order quantum corrections
in acceleration in the chiral limit. In conclusion\, the\n\neffect associ
ated with the existence of instability for accelerated medium at Unruh tem
perature is discussed.\nhttps://agenda.infn.it/event/20968/
LOCATION:
URL:https://agenda.infn.it/event/20968/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Signatures of chiral symmetry restoration in dilepton production
DTSTART;VALUE=DATE-TIME:20191127T133000Z
DTEND;VALUE=DATE-TIME:20191127T143000Z
DTSTAMP;VALUE=DATE-TIME:20191214T015100Z
UID:indico-event-20134@agenda.infn.it
DESCRIPTION:Speakers: Chihiro Sasaki (IFT Wroclaw\, Poland)\nWe study the
structural change of the vector spectral function and integrated\n\nproduc
tion rates of dileptons in the presence of the chiral mixing induced\n\nex
clusively\n\nat finite density. The mixing produces multiple bumps and pea
ks around the\n\nvacuum\n\nmasses of the $\\rho\, \\omega$ and $\\phi$ res
onances in the spectral function.\n\nThe arising modification becomes pron
ounced when the mass difference between\n\nparity partners decreases. In p
articular\, the emergent enhancement around the\n\nvacuum $\\phi$ meson in
the production rates serves as an excellent signature\n\nof the partially
-restored chiral symmetry in heavy-ion collisions.\nhttps://agenda.infn.it
/event/20134/
LOCATION:
URL:https://agenda.infn.it/event/20134/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement measures in generalised quantum Lifshitz models
DTSTART;VALUE=DATE-TIME:20191128T133000Z
DTEND;VALUE=DATE-TIME:20191128T143000Z
DTSTAMP;VALUE=DATE-TIME:20191214T015100Z
UID:indico-event-20862@agenda.infn.it
DESCRIPTION:Speakers: Valentina Giangreco Marotta Puletti (University of I
celand)\n \n\nThe talk focusses on the computation and analysis of entang
lement measures in generalised quantum Lifshitz models. These are free fie
ld theories with Lifshitz scaling symmetry which extend the (2+1)-dimensio
nal quantum Lifshitz model to higher dimension\, and provide us with simpl
e models for non-relativistic critical theories. I will introduce various
entanglement measures\, such as entanglement entropy and logarithmic negat
ivity (suitable to characterising quantum entanglement for pure and mixed
states respectively)\, outline their computation in generalised quantum Li
fshitz theories\, and discuss the results. \nhttps://agenda.infn.it/event
/20862/
LOCATION:
URL:https://agenda.infn.it/event/20862/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice study of CME in Dirac semimetals and quark gluon plasma
DTSTART;VALUE=DATE-TIME:20191204T133000Z
DTEND;VALUE=DATE-TIME:20191204T143000Z
DTSTAMP;VALUE=DATE-TIME:20191214T015100Z
UID:indico-event-20568@agenda.infn.it
DESCRIPTION:Speakers: Victor Braguta (ITEP)\nhttps://agenda.infn.it/event/
20568/
LOCATION:281
URL:https://agenda.infn.it/event/20568/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Double-Logarithmic contribution to Pomeron and application to the
photon-photon scattering
DTSTART;VALUE=DATE-TIME:20191211T133000Z
DTEND;VALUE=DATE-TIME:20191211T143000Z
DTSTAMP;VALUE=DATE-TIME:20191214T015100Z
UID:indico-event-20593@agenda.infn.it
DESCRIPTION:Speakers: Boris Ermolaev (Ioffe Physico-Technical Institute)\n
Pomeron was introduced in 1958 in the framework of phe- nomenological Regg
e theory. It is supposed to govern the high-energy asymp- totics of variou
s hadronic processes and control dependence of the total cross section on
the energy. There are phenomenological and QCD based Pomerons in the liter
ature. The best-known QCD contribution to Pomeron comes from the BFKL equa
tion which resums Leading Logarithmic (LL) contributions\, i.e. the single
-logarithmic contributions multiplied by the overall factor s (or 1/x f
or the inclusive processes). The high-energy asymptotics of this resum- ma
tion is known as the BFKL Pomeron.\n\nIn contrast\, a contribution to Pome
ron obtained in the Double-Logarithmic Approximation (DLA) does not involv
e such factor. By this reason it looks negligibly small and as a result su
ch DL contributions were ignored by the HEP society.\n\nUsing the γ ∗
γ ∗ -scattering amplitude Aγ γ as an example\, we demonstrate\n
\nthat the DL contribution to Pomeron is of the same value as the BFKL con
-\n\ntribution. We also show that the higher accuracy of calculation the l
ower\n\nis the Pomeron intercept. We fix the applicability region for Pome
ron (for\n\nexample\, the asymptotics of Aγγ can be used at x < 10
−6 Q21Q2\, with Q21\,2 being the photon virtualities). The use of Pom
erons outside its proper appli- cability region leads to misconceptions su
ch as introducing phenomenological ”hard” Pomerons for both unpolarize
d and spin-dependent processes.\nhttps://agenda.infn.it/event/20593/
LOCATION:
URL:https://agenda.infn.it/event/20593/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Circuit complexity and 2D bosonisation
DTSTART;VALUE=DATE-TIME:20191212T133000Z
DTEND;VALUE=DATE-TIME:20191212T143000Z
DTSTAMP;VALUE=DATE-TIME:20191214T015100Z
UID:indico-event-20759@agenda.infn.it
DESCRIPTION:Speakers: Dongsheng Ge (ENS Paris)\nWe consider the circuit co
mplexity of free bosons\, or equivalently free fermions\, in 1+1 dimension
s. Motivated by the results of [arXiv:1707.08570] and [arXiv:1803.10638\,
arXiv:1801.07620] who found different behavior in the complexity of free b
osons and fermions\, in any dimension\, we consider the 1+1 dimensional ca
se where\, thanks to the bosonisation equivalence\, we can consider the sa
me state from both the bosonic and the fermionic perspectives. In this way
the discrepancy can be attributed to a different choice of the set of gat
es allowed in the circuit. We study the effect in two classes of states: i
) bosonic-coherent / fermionic-gaussian states\; ii) states that are both
bosonic- and fermionic-gaussian. We consider the complexity relative to th
e ground state. In the first class\, the different results can be reconcil
ed admitting a mode-dependent cost function in one of the descriptions. Th
e differences in the second class are more important\, in terms of the cut
off-dependence and the overall behavior of the complexity. The talk will b
e based on the work arXiv:1904.03003.\n \nhttps://agenda.infn.it/event/20
759/
LOCATION:Room B (GGI Arcetri)
URL:https://agenda.infn.it/event/20759/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TBA
DTSTART;VALUE=DATE-TIME:20200219T133000Z
DTEND;VALUE=DATE-TIME:20200219T153000Z
DTSTAMP;VALUE=DATE-TIME:20191214T015100Z
UID:indico-event-20613@agenda.infn.it
DESCRIPTION:Speakers: Shira Chapman (University of Amsterdam)\nhttps://age
nda.infn.it/event/20613/
LOCATION:
URL:https://agenda.infn.it/event/20613/
END:VEVENT
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