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VERSION:2.0
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BEGIN:VEVENT
SUMMARY:Quasiparticle anisotropic hydrodynamics for ultrarelativistic heav
y-ion collisions
DTSTART;VALUE=DATE-TIME:20170628T080500Z
DTEND;VALUE=DATE-TIME:20170628T083000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12518@agenda.infn.it
DESCRIPTION:Speakers: Mubarak Alqahtani (Kent State University)\nWe presen
t the first comparisons of experimental data with phenomenological results
from 3+1d quasiparticle anisotropic hydrodynamics (aHydroQP). We compare
charged-hadron multiplicity\, identified-particle spectra\, identified-pa
rticle average transverse momentum\, charged-particle elliptic flow\, and
identified-particle elliptic flow produced in LHC 2.76 TeV Pb+Pb collision
s. The dynamical equations used for the hydrodynamic stage utilize non-co
nformal aHydroQP. The resulting aHydroQP framework naturally includes bot
h shear and bulk viscous effects in addition to higher-order non-linear tr
ansport coefficients. The 3+1d aHydroQP evolution obtained is self-consis
tently converted to hadrons using anisotropic Cooper-Frye freezeout perfor
med on a fixed-energy-density hypersurface. The final production and deca
ys of the primordial hadrons are modeled using a customized version of THE
RMINATOR 2. In this first study\, we utilized smooth Glauber-type initial
conditions and a single effective freeze-out temperature $T_{\\rm FO} = 1
30$ MeV with all hadronic species in full chemical equilibrium. With this
rather simple setup\, we find a very good description of many heavy-ion o
bservables.\n\nhttps://agenda.infn.it/event/12163/contributions/12518/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12518/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermal Sommerfeld effect for P-wave quarkonium in lattice NRQCD
DTSTART;VALUE=DATE-TIME:20170628T101500Z
DTEND;VALUE=DATE-TIME:20170628T104000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12517@agenda.infn.it
DESCRIPTION:Speakers: Seyong Kim (Sejong University)\nAnnihilation of heav
y particles in thermal environment (e.g.\, quarkonium decay in Quark-Gluon
Plasma and heavy dark matter particle annihilation in early universe) is
influenced by long distance non-perturbative effect because multple exchan
ges of light particle between slow-moving incoming heavy particle is possi
ble. Previously\, we found that the existence of bound states in thermal Q
CD can lead to large enhancement for S-wave pair annihilation of\nheavy qu
ark and heavy anti-quark in QGP by lattice NRQCD measurement. We continue
our study of thermally averaged Sommerfeld factor\, and here we report on
our recent lattice calculation of the Sommerfeld factor for P-wave channel
.\n\nhttps://agenda.infn.it/event/12163/contributions/12517/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12517/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Сonfinement-deconfinement transition in dense two-color QCD
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12516@agenda.infn.it
DESCRIPTION:Speakers: Aleksandr Nikolaev (ITEP & FEFU)\nIn this report we
study the properties of the dense SU(2) QCD. The\nlattice simulations are
carried out with improved gauge action and\nsmaller lattice spacing as com
pared to our previous work. This allowed us to approach closer to the cont
inuum limit and reach larger densities without lattice artifacts. We measu
red string tension and Polyakov loop as functions of chemical potential an
d temperature. At sufficiently large baryon density and zero temperature w
e observe confinement/deconfinement transition which manifests itself as a
vanishing of the string tension and rising of the Polyakov loop.\n\nhttps
://agenda.infn.it/event/12163/contributions/12516/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12516/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Canonical Approach for Exploring Finite Density QCD
DTSTART;VALUE=DATE-TIME:20170626T094500Z
DTEND;VALUE=DATE-TIME:20170626T101000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12515@agenda.infn.it
DESCRIPTION:Speakers: Atsushi Nakamura (FEFU)\nCanonical approach is a way
to map QCD at imaginary chemical potential regions to the real ones. The
essential idea is simple: Z(¥mu\,T) = ¥sum_n Z_n (exp(¥mu/T))^n\, wher
e Z_n\, the canonical partition functions\, do not depend on ¥mu. We con
struct Zn in the imaginary ¥mu regions\, and we can calculate Z(¥mu\,T)
at any real ¥mu.\nSince Z_n drops very fastly as |n| increases\, and we m
ust fight against the overlap problem\, we need several algorithmic and co
mputational tricks\, such as a multi-precision calculation. \nIn Vladivos
tok\, we have investigated the sources of unstable Z_n\, and developed me
thods to overcome them. I will report these studies and the outcomes\, es
pecially those for comparison of heavy ion collision experiment.\n\nhttps:
//agenda.infn.it/event/12163/contributions/12515/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12515/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Curvature of the pseudo-critical line in QCD: comparison of analyt
ic continuation and Taylor expansion methods
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12514@agenda.infn.it
DESCRIPTION:Speakers: Kevin Zambello (P)\nWe study the curvature of the ps
eudo-critical line in N_f=2+1 QCD through numerical simulations performed
using the tree-level Symanzik gauge action and the stout-smeared staggered
action. The location of the phase transition is determined from the infle
ction point of the renormalized chiral condensate and the curvature coeffi
cient is calculated using the Taylor expansion adopting various definition
s. We also compare our findings with previous results available in the lit
erature.\n\nhttps://agenda.infn.it/event/12163/contributions/12514/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12514/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice simulation of Chiral Magnetic Effect in Dirac Semimetals
DTSTART;VALUE=DATE-TIME:20170627T133000Z
DTEND;VALUE=DATE-TIME:20170627T135500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12513@agenda.infn.it
DESCRIPTION:Speakers: Andrey Kotov (Institute for Theoretical and Experime
ntal Physics)\nRecently discovered Dirac Semimetals Na3Bi and Cd3As2 provi
de\nperfect opportunity for investigation of phenomena which\nwere usually
attibuted to high energy physics. The reason for this\nis the existence o
f two massless Dirac fermions in the quasi-particle\ndispersion relation f
or these materials.\nOne of the manifestations of the chiral anomaly\, Chi
ral Magnetic Effect\,\ncan be be observed in these materials as a large ma
gnetoconductivity.\nWe study the conductivity of these materials in extern
al magnetic field\nwithin lattice effective field theory approach.\nOur re
sults confirm the existence of Chiral Magnetic Effect in Dirac Semimetals.
\n\nhttps://agenda.infn.it/event/12163/contributions/12513/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12513/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scale invariant resummed perturbation at finite temperature
DTSTART;VALUE=DATE-TIME:20170627T101500Z
DTEND;VALUE=DATE-TIME:20170627T104000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12512@agenda.infn.it
DESCRIPTION:Speakers: Jean-Loic Kneur (Lab. Charles Coulomb (L2C) Montpell
ier)\nWe will illustrate how our recently developed \nrenormalization grou
p optimized perturbation (RGOPT) efficiently resums perturbative expansion
s in thermal field theories. The resulting convergence and scale dependenc
e of optimized thermodynamical quantities are drastically improved as comp
ared to standard perturbative expansions\, as well as compared to other re
lated methods such as the screened perturbation or (resummed) hard-thermal
-loop perturbation. Our general method will be illustrated for the nonline
ar sigma model\, as a toy model for thermal QCD\, and we will also discuss
application of RGOPT to hard thermal loop resummation for QCD thermodynam
ical quantities.\n\nhttps://agenda.infn.it/event/12163/contributions/12512
/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12512/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Landau levels in lattice QCD in an external magnetic field
DTSTART;VALUE=DATE-TIME:20170627T135500Z
DTEND;VALUE=DATE-TIME:20170627T142000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12511@agenda.infn.it
DESCRIPTION:Speakers: Matteo Giordano (Eotvos University)\nI will discuss
the issue of Landau levels of quarks in lattice QCD in\nan external magnet
ic field. In two dimensions the lowest Landau level\ncan be identified una
mbiguously even if the strong interactions are\nturned on. This allows to
define a "lowest Landau level" also in the\nfour-dimensional case. It is t
hen possible to study to what extent the\neffect of a magnetic field on ob
servables can be explained in terms of\nthe lowest Landau level\, and test
the validity of low-energy models of\nQCD that make use of the lowest-Lan
dau-level approximation.\n\nhttps://agenda.infn.it/event/12163/contributio
ns/12511/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12511/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Investigating Columbia plot with clover fermions
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12510@agenda.infn.it
DESCRIPTION:Speakers: Yoshifumi Nakamura (RIKEN)\nWe investigate the criti
cal endpoints of the finite temperature\nphase transition of QCD at zero c
hemical potential.\nWe employ the renormalization-group improved Iwasaki g
auge action and\nnon-perturbatively $O(a)$-improved Wilson-clover fermion
action.\nThe critical endpoints are determined by using the intersection
point of kurtosis\,\nemploying the multi-parameter\, multi-ensemble reweig
hting method.\nWe present results for the critical endline at $N_t=6$ and
the continuum extrapolation\nfor the critical endpoint of the SU(3)-flavor
symmetric point.\n\nhttps://agenda.infn.it/event/12163/contributions/1251
0/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12510/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Canonical simulations of heavy-dense QCD without a sign problem
DTSTART;VALUE=DATE-TIME:20170626T085000Z
DTEND;VALUE=DATE-TIME:20170626T091500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12509@agenda.infn.it
DESCRIPTION:Speakers: Urs Wenger (Institute for Theoretical Physics\, Univ
ersity of Bern)\nIn this talk I show how the canonical formulation of QCD
can be\nobtained from transfer matrices defined directly in the canonical\
nsectors of QCD. These transfer matrices are closely related to the\ndimen
sionally reduced Wilson fermion determinant and provide a\ncomplete tempor
al factorization of the fermion determinant. In the\nheavy-dense limit\, t
he fermionic contributions to the canonical\npartition functions can be ca
lculated analytically and I show that the\nsign problem is absent at infin
itely strong coupling. Finally\, I\nconstruct a cluster algorithm which so
lves the sign problem away from\nthe strong coupling limit.\n\nhttps://age
nda.infn.it/event/12163/contributions/12509/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12509/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$SU(2N_F)$-Ward identities for QCD with restored chiral symmetry
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12508@agenda.infn.it
DESCRIPTION:Speakers: Vasily Sazonov (LPT Orsay\, Université Paris-Sud)\n
Motivated by the recent discovery of the $SU(2N_F)$ symmetric degeneracy i
n the spectrum of QCD with truncated low modes of the Dirac operator\, we
derive Ward identities associated to $SU(2N_F)$-transformations in the lim
it of vanishing quark masses. Low temperature QCD is not invariant under t
he $SU(2N_F)$-transformations due to the non-invariance of the classical a
ction and the path integral measure\, its part related to chiral symmetry
is broken spontaneously. We show that\, when the quark condensate vanishes
at sufficiently high temperature or when it is removed artificially\, the
restoration of chiral symmetry leads to the simplification of the $SU(2N_
F)$-Ward identities. The simplified Ward identities look like they would b
e if $SU(2N_F)$ is preserved by the classical action and path integral mea
sure.\n\nhttps://agenda.infn.it/event/12163/contributions/12508/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12508/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Flux tubes in Nf=2+1 QCD with magnetic fields
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12507@agenda.infn.it
DESCRIPTION:Speakers: Francesco Negro (PI)\nWe study the confining flux tu
be between two static color sources and its scaling towards the continuum
limit in Nf=2+1 QCD at the physical point.\nTo this aim\, we discretize th
e theory with the tree level Symanzik gauge action and stout-smearing impr
oved staggered quarks. We discuss the effect of a uniform external magneti
c field on the flux tube and we show\, in particular\, that it displays an
isotropies with respect to the magnetic field direction.\n\nhttps://agenda
.infn.it/event/12163/contributions/12507/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12507/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Energy-momentum tensor correlation function in Nf=2+1 full QCD at
finite temperature
DTSTART;VALUE=DATE-TIME:20170628T145500Z
DTEND;VALUE=DATE-TIME:20170628T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12506@agenda.infn.it
DESCRIPTION:Speakers: Yusuke Taniguchi (University of Tsukuba)\nWe measure
correlation functions of energy-momentum tensor in Nf=2+1 full QCD at fin
ite temperature\nby applying the gradient flow method both to the gauge an
d quark fields.\nOur main interest is to study the conservation law of the
energy-momentum tensor and\nto extract thermodynamical quantities from th
e correlation function.\nWe adopt a fine lattice spacing a=0.07 (fm) and c
over a wide range of temperature region\n$174\\le T\\le697$ MeV.\nThe ud q
uark mass is rather heavy with $m_{\\pi}/m_{\\rho}\\simeq0.63$ while the s
quark mass is set to approximately its physical value.\n\nhttps://agenda.
infn.it/event/12163/contributions/12506/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12506/
END:VEVENT
BEGIN:VEVENT
SUMMARY:General equilibrium second-order hydrodynamic coefficients for qua
ntum fields
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12505@agenda.infn.it
DESCRIPTION:Speakers: Matteo Buzzegoli (FI)\nThe quark-gluon plasma create
d in heavy ion collisions can be described as a\nrelativistic fluid with h
igh values of acceleration and vorticity and\, in such\nextreme local equi
librium conditions\, the standard hydrodynamic equations are\nexpected to
receive corrections from the non-ideal non-dissipative terms of the\nstres
s-energy tensor. \n\nWe show how these corrections can be obtained in a s
ystematical way by\nperforming a perturbative expansion around the homogen
eous global equilibrium\ncondition for small values of acceleration and vo
rticity. The final outcome is\nthat the thermodynamic coefficients associa
ted with these corrections can be\nexpressed in term of euclidean correlat
ors of the stress-energy tensor operator\nand the generators of the Lorent
z group.\n\nThese correlators can in principle be estimated nonperturbativ
ely by lattice\nQCD techniques and we will present the analytic results th
at can be obtained in\ntwo cases: a free scalar charged field and a free D
irac field\, both massive\nand massless.\n\nhttps://agenda.infn.it/event/1
2163/contributions/12505/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12505/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Compactified gauge theories under extreme conditions
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12504@agenda.infn.it
DESCRIPTION:Speakers: Mohamed Anber (Lewis & Clark College)\nTBD\n\nhttps:
//agenda.infn.it/event/12163/contributions/12504/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12504/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Temperature dependence of bulk viscosity in SU(3)-gluodynamics
DTSTART;VALUE=DATE-TIME:20170628T143000Z
DTEND;VALUE=DATE-TIME:20170628T145500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12503@agenda.infn.it
DESCRIPTION:Speakers: Victor Braguta (ITEP)\nThis report is devoted to the
study of temperature dependence of bulk\nviscosity in SU(3)-gluodynamics.
To calculate bulk viscosity we\nmeasured the correlation function of the
trace anomaly for a set of\ntemperatures in the region T/T_c \\in (0.9\, 1
.5). We used multilevel\nalgorithm which allowed us to improve the accurac
y of the data. To\nextract the values of bulk viscosity we used two approa
ches: fitting\nof the data by physically motivated ansatz and the Backus-G
ilbert\nmethod.\n\nhttps://agenda.infn.it/event/12163/contributions/12503/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12503/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diagrammatic Monte-Carlo for large-N non-Abelian lattice field the
ories based on the convergent weak-coupling expansion
DTSTART;VALUE=DATE-TIME:20170627T104000Z
DTEND;VALUE=DATE-TIME:20170627T110500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12502@agenda.infn.it
DESCRIPTION:Speakers: Pavel Buividovich (Regensburg University)\nWe demons
trate that non-Abelian lattice field theories such as principal chiral mod
el and pure lattice gauge theory in the large-N limit admit infrared-finit
e weak-coupling expansion in powers of coupling and logs of coupling\, rem
iniscent of re-summed series in thermal field theory and resurgent trans-s
eries without exponential terms. Such a double-series structure arises due
to the bare mass term proportional to the coupling constant\, which stems
from the Jacobian in the path integral measure and is absent in the scale
-invariant classical action. This term renders the perturbative expansion
infrared-finite even for an infinite lattice size\, which allows to sample
it using Diagrammatic Monte-Carlo. On the exactly solvable example we dem
onstrate that this expansion incorporates the non-perturbative mass gap. W
e then develop a DiagMC algorithm for sampling planar diagrams in the prin
cipal chiral model and numerically demonstrate the convergence of our expa
nsion for up to 12 leading orders\, which is the practical limit set by th
e increasingly strong sign problem at high orders. We find reasonably good
agreement with conventional Monte-Carlo\, extrapolated to infinite N. Fin
ally\, we comment on the applicability of our approach to planar QCD at ze
ro and finite density.\n\nhttps://agenda.infn.it/event/12163/contributions
/12502/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12502/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alternatives to the stochastic "noise vector" approach
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12501@agenda.infn.it
DESCRIPTION:Speakers: Benjamin Jaeger (ETH Zurich)\nSeveral important obse
rvables\, like the quark condensate and the Taylor coefficients of the QCD
pressure with respect to the chemical potential\, are based on the trace
of the inverse Dirac operator or its powers. Such traces are traditionally
estimated with "noise vectors". We explore alternative approaches based o
n polynomial approximations of the inverse Dirac operator.\n\nhttps://agen
da.infn.it/event/12163/contributions/12501/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12501/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thimble regularization 5 years later
DTSTART;VALUE=DATE-TIME:20170626T080000Z
DTEND;VALUE=DATE-TIME:20170626T082500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12500@agenda.infn.it
DESCRIPTION:Speakers: Francesco Di Renzo (PR)\nThe proposal of thimble reg
ularization as a solution to the\nsign problem is by now 5 years old. A re
port on recent work\ndone in Parma is presented. This includes progress in
our \nalgorithmic solutions\, in particular with respect to cases in\nwhi
ch multiple thimbles are to be taken into account. Very\nmuch related to t
his\, the role of symmetries is discussed.\nFinally\, an update on thimble
simulations of gauge theories is\npresented.\n\nhttps://agenda.infn.it/ev
ent/12163/contributions/12500/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12500/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Patterns and Partners for chiral symmetry restoration
DTSTART;VALUE=DATE-TIME:20170626T110000Z
DTEND;VALUE=DATE-TIME:20170626T112500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12499@agenda.infn.it
DESCRIPTION:Speakers: Ángel Gómez Nicola (Universidad Complutense Madrid
)\nThe nature of chiral symmetry restoration and the identification of it
s correct pattern in terms of $O(4)$ and $U(1)_A$ restoration are central
problems for our present understanding of the QCD phase diagram\, which
are not fully settled in lattice simulations. We will present a theoreti
cal analysis based on Ward Identities which sheds light on this issue and
where partner degeneration is systematically studied and connected with p
hysical processes for the full scalar/pseudoscalar $U(3)$ meson nonets.
Model-independent results are derived\, which in addition allow to unde
rstand the temperature dependence of lattice screening masses through par
ticular quark condensate combinations. Their realization in $U(3)$ Chiral
perturbation Theory will also be described. Special attention will be pai
d to the role of the thermal $f_0(500)$ state to describe lattice data
for the scalar susceptibility through thermal corrections to its pole pa
rameters generated from unitarized pion scattering.\n\nhttps://agenda.in
fn.it/event/12163/contributions/12499/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12499/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD thermodynamics. Hard-thermal-loop perturbation theory vs latti
ce
DTSTART;VALUE=DATE-TIME:20170627T095000Z
DTEND;VALUE=DATE-TIME:20170627T101500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12498@agenda.infn.it
DESCRIPTION:Speakers: Jens Oluf Andersen (NTNU)\nThe perturbative series f
or finite-temperature field theories has very poor convergence properties
and one needs a way to reorganize it. In this talk\, I review \none way of
reorganizing the perturbative series thermal QCD\, \nnamely hard-thermal-
loop perturbation theory (HTLpt).\nI will present results for the pressure
\, trace anomaly\, speed of sound and the quark susceptibilities from a 3-
loop HTLpt calculation.\nA careful comparison with available lattice data
shows good agreement for a number of physical quantities.\n\nhttps://agend
a.infn.it/event/12163/contributions/12498/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12498/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dispersion relations of charged and uncharged pions in presence of
weak magnetic field
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12496@agenda.infn.it
DESCRIPTION:Speakers: Souvik Priyam Adhya (Post doctoral fellow)\nIn this
work\, the self energies of $\\pi_0$ and $\\pi_{\\pm}$ up to one loop ord
er have been calculated in the limit of weak\nexternal magnetic field . Th
e effective\nmasses get an explicit magnetic field dependence which are mo
dified significantly for the pseudo-scalar coupling due to weak field appr
oximation of the external field. However\, for the pseudo-vector coupling\
, only a modest reduction in the effective masses are noted. These theoret
ical developments are relevant for the study of the phenomenological aspec
t of mesons in the context of neutron stars as well as heavy ion collision
s.\n\nhttps://agenda.infn.it/event/12163/contributions/12496/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12496/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constraints on extreme density matter from GW observa- tion of neu
tron star mergers
DTSTART;VALUE=DATE-TIME:20170628T123000Z
DTEND;VALUE=DATE-TIME:20170628T131000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12495@agenda.infn.it
DESCRIPTION:Speakers: Sebastiano Bernuzzi (PR)\nNeutron stars in binary sy
stems are among the strongest sources of gravitational waves and among the
main targets for ground-based gravitational-wave interferometers Advanced
LIGO and Virgo. The observation of these events in the gravitational-wave
window can provide us with unique information on neutron stars' masses\,
radii\, and spins\, including the possibility to set strong constraints o
n the unknown equation of state of matter at supranuclear densities. A cru
cial and necessary step for the development of gravitational-wave astronom
y with these sources is the precise knowledge of the dynamics of the sourc
es and of the emitted waveforms. I will talk about recent developments on
the modeling of gravitational waves from neutron star mergers using numeri
cal simulations in general relativity\, focusing on how these observations
can constrain extreme density matter.\n\nhttps://agenda.infn.it/event/121
63/contributions/12495/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12495/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dense nuclear and quark matter in holographic QCD
DTSTART;VALUE=DATE-TIME:20170626T140500Z
DTEND;VALUE=DATE-TIME:20170626T143000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12494@agenda.infn.it
DESCRIPTION:Speakers: Andreas Schmitt (University of Southampton)\nDense m
atter in the core of neutron stars is strongly coupled and presents an eno
rmous theoretical challenge. First-principle methods from QCD are currentl
y known only for vanishing or asymptotically large baryon densities\, whil
e phenomenological models are usually restricted to either nuclear or quar
k matter and/or contain many unknown parameters. I will discuss whether an
d how holographic methods can help. In particular\, I will present latest
work on nuclear matter and the chiral phase transition to quark matter in
the Sakai-Sugimoto model\, potentially leading to a strongly coupled equat
ion of state with only 3 parameters that is applicable over a wide density
regime.\n\nhttps://agenda.infn.it/event/12163/contributions/12494/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12494/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin simulations of a finite density model for QCD
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12493@agenda.infn.it
DESCRIPTION:Speakers: Savvas Zafeiropoulos (College of William & Mary and
Jefferson Lab)\nWe study an RMT model for QCD at finite density using the
Complex Langevin algorithm. Naive implementation of the algorithm shows co
nvergence towards the phase quenched or quenched theory. A detailed analys
is of this issue and a potential resolution of the failure of this algorit
hm are discussed. Among others we study the behavior of the real and imagi
nary parts of the action under Langevin evolution\, the distribution of th
e eigenvalues of the Dirac operator as well as the evolution of the fermio
n determinant. We find that the correct result can be obtained by a reweig
hting procedure. This indicates that there is a "residual phase" which is
not taken into account by the Langevin algorithm\, which is probabilistic\
, but when it is included explicitly\, the correct result is obtained.\n\n
https://agenda.infn.it/event/12163/contributions/12493/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12493/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice study of continuity and finite-temperature transition in $
2d$ $SU(N) \\times SU(N)$ Principal Chiral Model
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12492@agenda.infn.it
DESCRIPTION:Speakers: Semen Valgushev (Regensburg University)\nWe present
first-principle lattice study of continuity conjecture in $2d$ $SU(N) \\ti
mes SU(N)$ Principal Chiral Model (PCM) on $\\mathbb{R} \\times S^1$ with
respect to circumference $L$ of $S^1$ in the presence of $Z(N)$-preserving
twist. The twist can be considered as analogous to Twisted Eguchi-Kawai r
eduction in lattice gauge theory. We study static correlation length and f
ind that it exhibits a peak at finite value of $\\rho \\equiv N L$\, the s
hape of which shows no dependence on $N$ if considered as a function of $\
\rho$. The peak separates two regions: $\\rho \\rightarrow \\infty$ where
static correlation length matches zero temperature value with periodic bou
ndary conditions and $\\rho \\rightarrow 0$ where it significantly decreas
es. Without twist we find a signature for large $N$ finite-temperature tra
nsition where correlation length demonstrates a peak enhancing with $N$. U
sing Gradient flow we study non-perturbative content of the theory and fin
d that this transition sets up at the point where typical size of uniton\,
unstable saddle point of PCM\, becomes comparable to $L$. After imposing
the twist saddle points become stable and effectively $1d$ in the region $
\\rho \\rightarrow 0$\, whereas in the opposite limit they resemble to $2d
$ profile of unitons with periodic boundary conditions. The position of th
e peak in correlation length with twisted boundary conditions seems to coi
ncide with the moment when $2d$ saddle points transform into effectively $
1d$. Our findings suggest possible crossover at finite value of $\\rho$ wh
ich might have impact on continuity conjecture in twisted PCM.\n\nhttps://
agenda.infn.it/event/12163/contributions/12492/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12492/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The struggle against the sign problem
DTSTART;VALUE=DATE-TIME:20170626T072000Z
DTEND;VALUE=DATE-TIME:20170626T080000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12491@agenda.infn.it
DESCRIPTION:Speakers: Philippe de Forcrand (ETH Zurich &\; CERN)\nThe '
sign problem'\, i.e. the presence of configurations with negative or compl
ex weight in the partition sum\, has been a technical obstacle of growing
importance\, which prevents the Monte Carlo study of many systems of physi
cal interest\, among them QCD in 'extreme' parameter regimes. I will recal
l some basic notions about the sign problem\, and review current attempts
to overcome it.\n\nhttps://agenda.infn.it/event/12163/contributions/12491/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12491/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Welcome and Introduction
DTSTART;VALUE=DATE-TIME:20170626T070000Z
DTEND;VALUE=DATE-TIME:20170626T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12490@agenda.infn.it
DESCRIPTION:https://agenda.infn.it/event/12163/contributions/12490/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12490/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic approaches to the study of strongly interacting matter
in extreme conditions
DTSTART;VALUE=DATE-TIME:20170626T130000Z
DTEND;VALUE=DATE-TIME:20170626T134000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12489@agenda.infn.it
DESCRIPTION:Speakers: Jorge Casalderrey Solana (University of Oxford)\nThe
strong correlations observed in particle production in heavy ion collisio
ns suggest strong interaction between the quarks and gluons that form the
Quark Gluon Plasma. These interactions are so large that indicate that the
QGP close to the deconfining transition may no be well approximated by a
gas of quasiparticles. This has highlighted the need to develop new tools
able to describe real-time processes in non-abelian gauge theory plasmas w
ithout quasiparticles. Holography provides such a tool. In this talk I wi
ll review recent theoretical and phenomenological results arising from the
gauge/gravity duality that shed light on how strongly coupled plasma is p
roduced\, interacts and quenches energetic probes.\n\nhttps://agenda.infn.
it/event/12163/contributions/12489/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12489/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent results on QCD thermodynamics from Lattice
DTSTART;VALUE=DATE-TIME:20170627T070000Z
DTEND;VALUE=DATE-TIME:20170627T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12488@agenda.infn.it
DESCRIPTION:Speakers: Sayantan Sharma (Tata Institute of Fundamental Resea
rch)\nFluctuations of conserved charges like baryon number and strangeness
are important observables to understand the nature and interactions betwe
en the degrees of freedom in different phases of QCD. The higher order flu
ctuations are particularly important to get information on the location of
possible QCD critical end-point and to understand the interplay between
fluctuations and non-trivial topological properties in QCD. In this talk I
will highlight the recent theoretical and algorithmic developments made i
n lattice gauge theory in calculating the higher moments of conserved char
ges. I will also discuss how the lattice data on fluctuations and correlat
ions of different conserved charges could be used for determining the QCD
equation of state at finite density\, to constraint the possible location
of critical end-point in the QCD phase diagram and understand the nature
and interactions among quasi-particles across the chiral crossover transit
ion in QCD.\n\nhttps://agenda.infn.it/event/12163/contributions/12488/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12488/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral effects in strong magnetic backgrounds: from QCD to condens
ed matter physics
DTSTART;VALUE=DATE-TIME:20170627T125000Z
DTEND;VALUE=DATE-TIME:20170627T133000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12487@agenda.infn.it
DESCRIPTION:Speakers: Igor Shovkovy (Arizona State University)\nChiral sym
metry and its breaking play a profound role in the theory of strong intera
ctions. Over the years\, numerous advances have been made in understanding
the dynamics responsible for chiral symmetry breaking in vacuum and its r
estoration at high temperatures. One of the instructive tools in studying
the underlying physics is a strong background magnetic field. On the one h
and\, such a field acts as a catalyst by helping the symmetry breaking via
the dimensional reduction and an increased density of low-energy states.
On the other\, the confinement is eroded by an enhanced screening from the
low-energy states in the strong magnetic field. The outcome is a subtle i
nterplay between the two competing dynamics that I will attempt to review.
I will also discuss the recent advances in pseudo-relativistic condensed
matter systems\, in which chirality plays an equally important role and a
number of interesting phenomena could be realized in the presence of stron
g magnetic fields.\n\nhttps://agenda.infn.it/event/12163/contributions/124
87/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12487/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cumulants of the quark number fluctuations from LQCD at imaginary
potentials
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12486@agenda.infn.it
DESCRIPTION:Speakers: Francesco Sanfilippo (INFN - Sezione Roma III)\nI pr
esent a determination of the cumulants of the quark number fluctuations\,
obtained via analytic continuation of Nf=2+1 physical quark mass lattice Q
CD simulations at imaginary chemical potentials. We employ stout improved
staggered fermions and tree level Symanzik gauge action\, exploring temper
atures ranging from 135 up to 350 MeV\, adopting mostly lattices with Nt=8
sites in the temporal direction.\nWe show that below Tc the method can be
strongly advantageous\, with respect to a direct Montecarlo sampling at
μ=0.\nWe discuss the radius of convergence of the Taylor expansion and th
e possible location of the second order critical point at real potential.
No evidence for such a point is found in the explored range of temperature
\, within present determinations of the pseudo-critical line.\n\nhttps://a
genda.infn.it/event/12163/contributions/12486/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12486/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strongly interacting matter in extreme conditions: insights from h
ydrodynamic modeling of heavy ion collisions
DTSTART;VALUE=DATE-TIME:20170628T070000Z
DTEND;VALUE=DATE-TIME:20170628T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12485@agenda.infn.it
DESCRIPTION:Speakers: Wojciech Florkowski (UJK Kielce / IFJ PAN Krakow)\nI
the first part of the talk I will review several physics features of stro
ngly interacting matter (such as\, for example\, equation of state and ki
netic coefficients) that have been established by comparing heavy-ion data
with hydrodynamic models. Then I will turn to the general problems of app
licability of relativistic viscous hydrodynamics\, in particular\, for des
cription of the early stages of heavy-ion collisions. Finally\, I will tur
n to observables connected with polarization of the observed particles and
comment on recent developments of relativistic fluid hydrodynamics with s
pin.\n\nhttps://agenda.infn.it/event/12163/contributions/12485/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12485/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological susceptibility and Gribov copies
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12484@agenda.infn.it
DESCRIPTION:Speakers: Caroline Felix (KU Leuven)\nThe topological suscepti
bility\, $\\chi^4$\, plays an important role in explaining the $\\eta^{\\
prime}$ mass\, the so-called $U(1)_{A}$ problem. For $\\chi^4 \\neq 0$\,
we must have the Veneziano ghost\, an unphysical massless pole in the corr
elation function of the topological current $K_{\\mu}$ correlator. There w
as a recent attempt in http://inspirehep.net/record/1340323?ln=\nen to con
nect the dynamics of the Veneziano ghost\, and thus topological susceptib
ility\, with Gribov copies. However\, we will discuss that this proposal i
s incompatible with BRST symmetry\, following http://inspirehep.net/record
/1402613?ln=en. We will also analyze the topological susceptibility in $SU
(2)$ and $SU(3)$ Euclidean Yang-Mills theory in a generic linear covariant
gauge taking into account the Gribov ambiguity\, while keeping the BRST s
ymmetry. During this analysis\, we make use of a Pad{\\' e} approximation
based on the K\\"all\\'en-Lehmann spectral integral representation of the
topological current correlation function.\n\nhttps://agenda.infn.it/event/
12163/contributions/12484/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12484/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charged pion condensation in chiral asymmetric dense quark matter
in the framework of a (1+1) NJL_2 model
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12483@agenda.infn.it
DESCRIPTION:Speakers: Tamaz Khunjua (Moscow State University M.V. Lomonoso
v)\nWe investigate the phase structure of a (1+1)-dimensional schematic qu
ark model with four-quark interaction and in the presence of baryon (μB)\
, isospin (μI) and chiral isospin (μI5) chemical potentials. It is estab
lished that in the large-Nc limit (Nc is the number of colored quarks) the
re exists a duality correspondence between the chiral symmetry breaking ph
ase and the charged pion condensation (PC) one. The role and influence of
this property on the phase structure of the model are studied. It is also
shown that the chemical potential μI5 promotes the appearance of the cha
rged PC phase with nonzero baryon density. Spatially inhomogeneous chiral
density wave (for chiral condensate) and single wave (for charged pion con
densate) approaches are also used.\n\nhttps://agenda.infn.it/event/12163/c
ontributions/12483/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12483/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fermion bag approach to Hamiltonian lattice field theories
DTSTART;VALUE=DATE-TIME:20170626T082500Z
DTEND;VALUE=DATE-TIME:20170626T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12482@agenda.infn.it
DESCRIPTION:Speakers: Shailesh Chandrasekharan (Duke University)\nHamilton
ian lattice field theories provide an alternate approach to study traditio
nal Lagrangian lattice field theories in the strongly interacting regime.
These formulations are more commonly used in condensed matter physics and
may be more natural in theories at finite densities. They can be formulate
d both in discrete and continuous time. In the continuous time formulation
they can help in reducing the fermion doubling problem. Some new sign pro
blems are also solvable within this approach. In the discrete time formula
tion they are very similar to traditional Lagrangian lattice field theorie
s but with unconventional actions. Unfortunately\, traditional Monte Carlo
methods for Hamiltonian lattice field theories seem to scale rather poorl
y with system size. Here we show that by using ideas of fermion bags we ca
n design algorithms that help speed up these calculations and allow us to
go to large lattices for the first time. Using this approach we compute cr
itical exponents of the 2+1d Gross-Neveu model with Nf=1\, which was impos
sible so far in Lagrangian lattice field theory.\n\nhttps://agenda.infn.it
/event/12163/contributions/12482/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12482/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Momentum anisotropy effects for quarkonium in a weakly-coupled qua
rk-gluon plasma below the melting temperature
DTSTART;VALUE=DATE-TIME:20170628T095000Z
DTEND;VALUE=DATE-TIME:20170628T101500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12481@agenda.infn.it
DESCRIPTION:Speakers: Simone Biondini (Albert Einstein Center\, Institute
for Theoretical Physics - Uni Bern)\nIn the early stages of heavy-ion coll
isions\, the hot QCD matter expands more longitudinally than transversely.
\nThis imbalance causes the system to become rapidly colder in the longitu
dinal direction and a local momentum anisotropy appears. \nIn this talk we
study the heavy-quarkonium spectrum in the presence of a small plasma ani
sotropy. \nWe work in the framework of potential non-relativistic QCD at f
inite temperature.\nWe inspect arrangements of non-relativistic and therma
l scales complementary to those considered in the literature. \nIn particu
lar\, we consider temperatures larger and Debye masses smaller than the bi
nding energy\, \nwhich is a temperature range relevant for presently runni
ng LHC experiments.\nIn this setting we compute the leading thermal correc
tions to the binding energy and the thermal width induced by quarkonium gl
uo-dissociation\n\nhttps://agenda.infn.it/event/12163/contributions/12481/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12481/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The QCD phase transition at large N as BKT type transition.
DTSTART;VALUE=DATE-TIME:20170627T083000Z
DTEND;VALUE=DATE-TIME:20170627T085500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12480@agenda.infn.it
DESCRIPTION:Speakers: Ariel Zhitnitsky (University of British Columbia)\nW
e conjecture that the phase transitions in QCD at large N is triggered
by the drastic changes in the instanton density\, and corresponding drasti
c modification of the \\theta behaviour in the system. We advocate the pic
ture that these very sharp changes is a result of complete reconstructio
n of the relevant Euclidean configurations when the instantons at large T
``dissociate" \ninto N fractionally charged constituents (the instanto
n quarks\, the instanton -dyons\, the instanton-monopoles\, you name it) a
t small T. This picture is quite universal and describes the corresponding
transitions in different circumstances. In particular\, the transition
to colour superconducting phase at \\mu>\\mu_c\, or to the conformal
phase (for sufficiently large N_f/N) can be described using the same uni
versal framework. The talk is based on few recent papers (see [1] and re
ferences therein) and some recent development. \n[1]. A. Zhitnitsky ``
Conformal window in QCD for large numbers of colours and flavours\,'' Nuc
l.\\ Phys.\\ A {\\bf 921}\, 1 (2014)\, arXiv:1308.0020 [hep-ph].\n\nhttps:
//agenda.infn.it/event/12163/contributions/12480/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12480/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QED and QCD with massless fermions in three dimensions
DTSTART;VALUE=DATE-TIME:20170627T154000Z
DTEND;VALUE=DATE-TIME:20170627T160500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12479@agenda.infn.it
DESCRIPTION:Speakers: Rajamani Narayanan (Florida International University
)\nRecent numerical results on QED and QCD with massless fermions in three
dimensions will be presented. The main focus will be classifying theories
as conformal or non-conformal. Results for the absence or presence of bil
inear condensates will be presented using the behavior of low lying eigenv
alues. Correlation functions of fermion bilinears will also be presented.\
n\nhttps://agenda.infn.it/event/12163/contributions/12479/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12479/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The QCD sign problem and the effective Polyakov line action
DTSTART;VALUE=DATE-TIME:20170626T101000Z
DTEND;VALUE=DATE-TIME:20170626T103500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12478@agenda.infn.it
DESCRIPTION:Speakers: Roman Höllwieser (VUT)\nWe suggest to solve the sig
n problem by mapping full QCD to an effective Polyakov line model. \nThe m
ethod of relative weights\, coupled with mean field theory\, is applied to
derive an effective action for an underlying SU(3) gauge theory with dyna
mical staggered fermions at finite densities. We present first results an
d discuss issues so far encountered.\n\nhttps://agenda.infn.it/event/12163
/contributions/12478/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12478/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutral pion matter in strong magnetic fields
DTSTART;VALUE=DATE-TIME:20170628T133500Z
DTEND;VALUE=DATE-TIME:20170628T140000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12477@agenda.infn.it
DESCRIPTION:Speakers: Tomas Brauner (University of Stavanger)\nThe ground
state of QCD in sufficiently strong external magnetic fields and at modera
te baryon chemical potential is a chiral soliton lattice (CSL) of neutral
pions. This is a model-independent result based on low-energy effective fi
eld theory\, and the magnetic fields and baryon densities required may occ
ur in the cores of neutron stars. The spectrum of excitations above the CS
L ground state contains a soft\, nonrelativistic mode that gives an anomal
ous contribution to pressure\, scaling with temperature and magnetic field
as $T^{5/2}B^{3/2}$. Finally\, I will argue that in stronger but still ac
hievable magnetic fields\, the neutral pion CSL background may catalyze Bo
se-Einstein condensation of charged pions.\n\nhttps://agenda.infn.it/event
/12163/contributions/12477/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12477/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermodynamics of QCD at physical point with (2+1)-flavors of impr
oved Wilson quarks using gradient flow
DTSTART;VALUE=DATE-TIME:20170628T152000Z
DTEND;VALUE=DATE-TIME:20170628T154500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12476@agenda.infn.it
DESCRIPTION:Speakers: Kazuyuki Kanaya (University of Tsukuba)\nThe energy-
momentum tensor and the chiral condensate are studied in (2+1)-flavor QCD
with improved Wilson quarks at the physical point\, applying the method of
Makino and Suzuki based on the gradient flow. Following a strategy of our
previous study at a heavier quark mass\, we adopt a nonperturbatively O(a
)-improved Wilson quark action and the renormalization group-improved Iwas
aki gauge action and perform finite-temperature simulations in the range $
T \\simeq 155$-544 MeV ($N_t = 4$-14 including odd numbers) at $a \\simeq
0.09$ fm based on the fixed-scale approach using zero-temperature physical
point configurations generated by the PACS-CS Collaboration. We present p
reliminary results on the equation of state and the chiral condensate obta
ined so far.\n\nhttps://agenda.infn.it/event/12163/contributions/12476/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12476/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inverse Magnetic Catalysis in Holographic QCD
DTSTART;VALUE=DATE-TIME:20170626T134000Z
DTEND;VALUE=DATE-TIME:20170626T140500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12475@agenda.infn.it
DESCRIPTION:Speakers: Matti Jarvinen (Ecole Normale Superieure\, Paris)\nL
attice simulations have shown recently that\, contrary to earlier expectat
ions\, the chiral condensate is suppressed with growing magnetic field nea
r the chiral and deconfinement transition temperatures of QCD\, a phenome
non now known as “Inverse Magnetic Catalysis”. V-QCD is a holographic
model for QCD\, which fully includes the backreaction of the quarks to the
gluonic degrees of freedom. I demonstrate that this holographic model rep
roduces the inverse magnetic catalysis\, and provides a good qualitative m
atch with lattice results for the condensate and related observables. In p
articular\, the inverse catalysis is enhanced with increasing number of fl
avors\, in agreement with lattice data. I will also comment on the predict
ions of the model at finite chemical potential and magnetic field.\n\nhttp
s://agenda.infn.it/event/12163/contributions/12475/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12475/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD Critical Point and Hydrodynamics
DTSTART;VALUE=DATE-TIME:20170628T074000Z
DTEND;VALUE=DATE-TIME:20170628T080500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12474@agenda.infn.it
DESCRIPTION:Speakers: Mikhail Stephanov (UIC)\nI shall discuss the physics
of fluctuations near the QCD critical point and application of hydrodynam
ics in the critical regime.\n\nhttps://agenda.infn.it/event/12163/contribu
tions/12474/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12474/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Correlation function of energy-momentum tensor in SU(3) gauge theo
ry from gradient flow
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12473@agenda.infn.it
DESCRIPTION:Speakers: Masakiyo Kitazawa (Osaka University)\nWe study the t
emporal correlators of energy-momentum tensor in various channels in SU(3)
gauge theory for two values of temperature T = 1.68T c and 2.24T c on the
lattice. The correlators are measured using energy-momentum tensor operat
ors constructed with the gradient flow\, which is found to be quite effect
ive to reduce the statistical error. We numerically confirm that temporal
correlators including a conserved charge (energy or momentum) are constant
s as is consistent with the energy-momentum conservation. It is also check
ed that these constants satisfy the linear response relations. A novel mea
surement of specific heat from the energy-energy correlator is performed.\
n\nhttps://agenda.infn.it/event/12163/contributions/12473/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12473/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calculation of $B_{K}$ with Wilson fermion using gradient flow
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12472@agenda.infn.it
DESCRIPTION:Speakers: Asobu Suzuki (University of Tsukuba)\n$B_{K}$ is a p
arameter which is related with the Kaon mixing and is one of the targets o
f Lattice QCD.\nNaive calculation of $B_{K}$ with the Wilson fermion is d
ifficult because the chiral symmetry is explicitly broken.\nIn this study
we shall present on our calculation of $B_{K}$ with the Wilson fermion by
applying the gradient flow method both to the gauge and quark fields.\nOur
study is based on a fact that the chiral symmetry is restored if we apply
the gradient flow to the Wilson fermion and take the continuum limit with
out bothering the UV divergence.\nThis property is already observed for pr
actical numerical simulation in Phys. Rev. D 95\, 054502 (2017)\, where th
e chiral Ward-Takahashi relation is effectively restored for the topologic
al susceptibility.\nIn our study we expect the same good property even for
the four fermi operators used for $B_{K}$.\n\nhttps://agenda.infn.it/even
t/12163/contributions/12472/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12472/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral phase transition of three flavor QCD with nonzero magnetic
field
DTSTART;VALUE=DATE-TIME:20170627T142000Z
DTEND;VALUE=DATE-TIME:20170627T144500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12471@agenda.infn.it
DESCRIPTION:Speakers: Akio Tomiya (CCNU)\nLattice simulations for (2+1)-fl
avor QCD demonstrated that the quark mass is one of the important paramete
rs responsible for the (inverse)-magnetic catalysis. In this talk we will
discuss the dependence of chiral condensates and susceptibilities on the m
agnetic field in three flavor QCD in the regime of the first order phase t
ransition. The lattice simulations were performed using standard staggered
fermions and the plaquette action with spatial sizes $N_s$ = 16 and 24 a
nd a fixed temporal size $N_t$ = 4. The value of the quark mass was chosen
such \nthat the system undergoes a first order chiral phase transition w
ith zero magnetic field.\nWe find that the quark chiral condensate undergo
es magnetic catalysis in the whole temperature region\, and the first orde
r phase transition becomes stronger as magnetic field increases. The under
lying mechanism will also be discussed.\n\nhttps://agenda.infn.it/event/12
163/contributions/12471/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12471/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Reweighted complex Langevin approach to chiral fermion models at f
inite density
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12470@agenda.infn.it
DESCRIPTION:Speakers: Hirotsugu Fujii (U Tokyo)\nWe apply complex Langevin
equation (CLE) to simulate the 0+1 dimensional Thirring model at finite d
ensity. In the crossover region the simulation fails because of the zero o
f the fermion determinant. To simulate the crossover retion\, we then appl
y the reweighting method with the ensembles generated with CLE at high eno
ugh chemical potential. We study the effectiveness of the reweighting met
hod by changing the model parameters\, the coupling constant\, mass\, latt
ice size\, from the viewpoint of the Lefschetz thimble structure of the mo
del. We also like to include results on chiral random matrix model at fini
te temperature and density\, applying the same strategy.\n\nhttps://agenda
.infn.it/event/12163/contributions/12470/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12470/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Taylor series expansions for higher order cumulants
DTSTART;VALUE=DATE-TIME:20170627T092500Z
DTEND;VALUE=DATE-TIME:20170627T095000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12469@agenda.infn.it
DESCRIPTION:Speakers: Frithjof Karsch (Brookhaven National Laboratory)\nWe
present results on Taylor series expansions for up to fourth order cumula
nts\nof conserved charge fluctuations\, construct expansions for ratios of
these\ncumulants and discuss their application to the analysis of freeze-
out conditions\nin heavy ion experiments. Our results are based on lattice
QCD calculations\nperformed with the HISQ action and quark masses tuned t
o their physical values.\n\nhttps://agenda.infn.it/event/12163/contributio
ns/12469/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12469/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Accurate Simulation of the Finite Density Thirring Model
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12468@agenda.infn.it
DESCRIPTION:Speakers: Jarno Rantaharju (Duke University)\nWe present a stu
dy of the finite density lattice Thirring model in 2 dimensions using the
world-line/fermion-bag algorithm. The model has features similar to QCD an
d provides a test case to explore the accuracy of various methods to solve
sign problems. In the massless limit and with open boundary conditions we
show that the sign problem is an artifact of the auxiliary field approach
and is completely eliminated in the world-line approach. With anti-period
ic boundary conditions the sign problem is mild on square lattices in the
fermion bag method. We present accurate results for various quantities in
the model that can be used as a benchmark for comparison with other method
s of solving sign problems.\n\nhttps://agenda.infn.it/event/12163/contribu
tions/12468/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12468/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New dynamic critical phenomena in nuclear and quark superfluids
DTSTART;VALUE=DATE-TIME:20170628T131000Z
DTEND;VALUE=DATE-TIME:20170628T133500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12467@agenda.infn.it
DESCRIPTION:Speakers: Noriyuki Sogabe (Keio University)\nWe study the stat
ic and dynamic critical phenomena near the possible high-density QCD criti
cal point in the superfluid phase of nuclear and quark matter. In particul
ar\, we find that its dynamic universality class is different from those s
tudied in QCD and condensed matter systems so far. We argue that this nove
lty stems from the interplay between the chiral criticality and the presen
ce of the superfluid phonon---a feature specific for high-density QCD crit
ical point.\n\nhttps://agenda.infn.it/event/12163/contributions/12467/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12467/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effects of magnetic field on the plasma evolution in relativistic
heavy ion collisions
DTSTART;VALUE=DATE-TIME:20170627T151500Z
DTEND;VALUE=DATE-TIME:20170627T154000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12466@agenda.infn.it
DESCRIPTION:Speakers: Shreyansh Shankar Dave (Institute of Physics)\nVery
strong magnetic fields can arise in noncentral heavyion collisions at
ultra relativistic energies\, which may not decay quickly in a conductin
g plasma. We carry out relativistic magnetohydrodynamics (RMHD) simulati
ons to study the effects of this magnetic field on the evolution of the pl
asma and on resulting flow fluctuations in the ideal RMHD limit. Our resul
ts show that magnetic field leads to enhancement in elliptic flow\, though
in general effects of magnetic field on elliptic flow are very complex. I
nterestingly\, we find that magnetic field in localized regions can tempor
arily increase in time as evolving plasma energy density fluctuations lead
to reorganization of magnetic flux. This can have important effects on ch
iral magnetic effect. Magnetic field has nontrivial effects on the power
spectrum of flow fluctuations. For very strong magnetic field case one se
es a pattern of evenodd difference in the power spectrum of flow coeffic
ients arising from reflection symmetry about the magnetic field direction
if initial state fluctuations are not dominant. We discuss the situation o
f nontrivial magnetic field configurations arising from collision of defor
med nuclei and show that it can lead to anomalous elliptic flow. Special (
crossed bodybody) configurations of deformed nuclei collision can lead t
o presence of quadrupolar magnetic field which can have very important eff
ects on the rapidity dependence of transverse expansion (similar to beam f
ocusing from quadrupole fields in accelerators). We also show the possibil
ity of the dynamo like effects in the presence of (CFL) superfluid vortex
(which may arise in low energy collisions experiments e.g. FAIR and NICA)
in our RMHD simulations.\n\nhttps://agenda.infn.it/event/12163/contributio
ns/12466/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12466/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermal entropic destruction of quark-antiquark pair from dynamica
l holographic QCD
DTSTART;VALUE=DATE-TIME:20170626T145500Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12465@agenda.infn.it
DESCRIPTION:Speakers: Subhash Mahapatra (KU Leuven)\nLattice QCD results i
ndicate a large amount of entropy associated with the quark-antiquark pair
near the deconfinement temperature. The lattice data show a sharp peak in
the quark-antiquark entropy near the transition temperature. Further\, th
is entropy increases with inter quark distances. In this work\, we used th
e gauge/gravity duality to reproduce these lattice results. For this purpo
se\, we consider a phenomenological bottom-up Einstein-Maxwell-dilaton gra
vity model and analytically construct the black hole solutions whose dual
boundary theories satisfy the properties of confinement as well as deconfi
nment. We study the entropy of the quark-antiquark pair in confinement/dec
onfiment phases and find that our holographic model qualitatively reproduc
es the corresponding lattice results for the entropy. We further provide h
olographic results with chemical potential\n\nhttps://agenda.infn.it/event
/12163/contributions/12465/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12465/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gluon and ghost correlation functions of 2-color QCD at finite den
sity
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12464@agenda.infn.it
DESCRIPTION:Speakers: Ouraman Hajizadeh (University of Graz)\nSU(2) is the
simplest non-abelian gauge theory with fermions without sign problem. The
refore its study on the lattice is a benchmark for other non-perturbative
approaches at finite density.\n\nWe study the Landau-gauge 2-point and 3-p
oint correlation functions of the gauge sector and the running gauge coupl
ing at finite density\, and compare them to the vacuum case.\n\nWe observe
d no significant effect of the finite density\, except for some screening
of the gluons. Moreover\, no strong signature of the phase change (if not
a lattice artifact) in the properties of quarks are observed in the gauge
sector\, in contrast to the finite-temperature case. This indicates that
the finite-density physics is essentially driven by the quarks\, rather th
an by the gluons.\n\nhttps://agenda.infn.it/event/12163/contributions/1246
4/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12464/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fate of quarkonium in a quark gluon plasma via a Lindblad equation
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12463@agenda.infn.it
DESCRIPTION:Speakers: Davide De Boni (Swansea University)\nWhat is the dyn
amics of heavy quarks and antiquarks in a quark gluon plasma? Can heavy-qu
ark bound states (quarkonia) dissociate? Can they (re)combine?\nThese are
the questions that this paper aims to address by investigating a Lindblad
equation that describes the quantum dynamics of the heavy particles in the
medium.\nThe Lindblad equations for a heavy quark and a heavy quark-antiq
uark pair are derived from the gauge theory after a chain of well defined
approximations. In this exploratory work the attention is restricted to th
e case of an abelian plasma\, but the extension to the non-abelian case is
feasable.\nA one-dimensional simulation of the Lindblad equation for a he
avy quark-antiquark pair is performed to extract information about bound-s
tate dissociation\, recombination and quantum decoherence. All these pheno
mena strongly depend on the imaginary part of the inter-quark potential ap
pearing in the Lindblad formulation.\n\nhttps://agenda.infn.it/event/12163
/contributions/12463/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12463/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strange baryons below and above the deconfinement transition
DTSTART;VALUE=DATE-TIME:20170627T074000Z
DTEND;VALUE=DATE-TIME:20170627T080500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12462@agenda.infn.it
DESCRIPTION:Speakers: Gert Aarts (Swansea University)\nWe investigate the
fate of strange baryons in the hadronic gas and the\nquark-gluon plasma. I
n the confined phase a strong temperature dependence\nis seen in the masse
s of the negative-parity groundstates\, while at high\ntemperature parity
doubling emerges. We study baryons with different\nstrangeness and find a
noticeable effect of the heavier s quark. This\nstudy uses nonperturbative
lattice simulations\, employing the FASTSUM\nanisotropic Nf = 2 + 1 ensem
bles.\n\nhttps://agenda.infn.it/event/12163/contributions/12462/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12462/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Flux Tubes in QCD across deconfinement
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12461@agenda.infn.it
DESCRIPTION:Speakers: Francesca Cuteri (Goethe Universität - Frankfurt am
Main)\nFlux Tubes in QCD across deconfinementFlux Tubes in QCD across dec
onfinementFlux Tubes in QCD across deconfinementFlux Tubes in QCD across d
econfinementFlux Tubes in QCD across deconfinementFlux Tubes in QCD across
deconfinementFlux Tubes in QCD across deconfinementFlux Tubes in QCD acro
ss deconfinement\n\nhttps://agenda.infn.it/event/12163/contributions/12461
/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12461/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase structure of large-N gauge theory at finite temperature
DTSTART;VALUE=DATE-TIME:20170627T160500Z
DTEND;VALUE=DATE-TIME:20170627T163000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12460@agenda.infn.it
DESCRIPTION:Speakers: Hiromichi Nishimura (BNL)\nWe use a semiclassical me
thod to analyze the phase structure of SU(N) gauge theory at infinite N in
the presence of the external field. The effective potential can be writt
en in terms of a Landau free energy for Polyakov loops\, and we construct
it using the perturbative contribution and a double trace deformation as t
he unknown confining potential. We show that there is a surface of a cont
inuous phase transition analogous to the Gross-Witten-Wadia transition\, w
hose boundary terminates at a tricritical point of a critical first-order
phase transition. Depending on the confining potential we have considered
\, it gives rise to a third\, fourth\, or fifth-order phase transition in
the Ehrenfest classification. Because the specific heat and the eigenvalu
e distribution of the Polyakov loop are sensitive to the confining potenti
al\, we argue that lattice simulations for large N could probe the order o
f phase transition as well as the form of the confining potential in any 1
+d dimensions.\n\nhttps://agenda.infn.it/event/12163/contributions/12460/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12460/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quarkonium spectral functions at finite temperature on large quenc
hed lattices and towards the continuum limit
DTSTART;VALUE=DATE-TIME:20170628T104000Z
DTEND;VALUE=DATE-TIME:20170628T110500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12459@agenda.infn.it
DESCRIPTION:Speakers: Hiroshi Ohno (University of Tsukuba)\nWe present our
recent studies about quarkonium spectral functions in lattice QCD at fini
te temperature. We performed lattice QCD simulations with the quenched app
roximation on very large and fine lattices. We calculated quarkonium corre
lation functions in a quark mass range between charm and bottom quarks at
temperatures between 0.75$T_c$ and 2.2$T_c$. Using the correlation functio
ns for our finest lattice with lattice spacing $a^-1$ = 22 GeV\, we recons
tructed spectral functions\, where we employed the conventional maximum en
tropy method as well as the stochastic methods to check systematic uncerta
inties. In this talk we discuss dissociation temperatures for charmonia an
d bottomonia and also show some estimates of the heavy quark diffusion coe
fficient. In addition\, we show some results on a continuum extrapolation
of the quarkonium correlation functions\, which has been done for the firs
t time\, towards the continuum limit of the spectral functions.\n\nhttps:/
/agenda.infn.it/event/12163/contributions/12459/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12459/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Collective Excitations in QCD Plasma
DTSTART;VALUE=DATE-TIME:20170628T083000Z
DTEND;VALUE=DATE-TIME:20170628T085500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12458@agenda.infn.it
DESCRIPTION:Speakers: Ali Davody (Institute of Theoretical Physics\, Regen
sburg University\, 93040 Regensburg\, Germany)\nWe study the long waveleng
th excitations in rotating QCD fluid coupled\nto an external magnetic fiel
d at finite vector and axial charge densities. We first find the generaliz
ation of the both well-known Chiral Magnetic Wave (CMW) and Chiral Vortica
l Wave (CVW)\, separately. It turns out that at µ5 = 0 and in the absence
of rotation\, there exist two CMWs which propagate in the same and in the
opposite directions of the magnetic field with the same velocities. Howev
er when µ5 6= 0\, one of the CMW modes propagates faster than the other a
nd additionally\, they do not necessarily propagate in the opposite direct
ions. The similar situation happens for the two CVWs in the rotating fluid
at finite axial chemical potential. We then show that in general\, when t
he fluid is either rotating and is coupled to a magnetic field\,\nthe CMW
and the CVW mix with each other and make the Chiral Magnetic-Vortical\nWav
e (CMVW). The resultant coupled waves have generally different velocities
compared to the sum of velocities of the individual waves. We also find an
other excitation in the QCD plasma\; the so-called Chiral Alfv´en Wave (C
AW)\, an analogue of what as recently found in a chiral fluid with single
chirality. We specifically show that in contrast to the latter case\, the
CAWs in QCD fluid may propagate only when both the vector and axial charge
densities are non-vanishing. Furthermore\, while the velocity of CAWs in
a chiral fluid with single chirality depends on the coefficient of a gravi
tational anomaly\, we show that in QCD fluid\, it depends on the coefficie
nts of both chiral and gravitational anomalies.\n\nhttps://agenda.infn.it/
event/12163/contributions/12458/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12458/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite temperature gluon spectral functions from twisted mass latt
ice QCD
DTSTART;VALUE=DATE-TIME:20170628T092500Z
DTEND;VALUE=DATE-TIME:20170628T095000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12457@agenda.infn.it
DESCRIPTION:Speakers: Ernst-Michael Ilgenfritz (JINR\, BLTP)\nI will repor
t on an attempt to fix the gluon spectral functions at finite\ntemperature
in Landau gauge. Our study used a novel Bayesiann approach\nfor the extra
ction of non-positive definite spectral functions.\nThe spectral functions
are extracted at three different lattice spacing.\nFor each of them\, a s
can of temperatures around the crossover transition\nis carried out.\nTher
e are indications for the existence of a well defined quasi-particle\npeak
. Due to a relatively small number of imaginary frequencies available\,\nw
e focus on the momentum and temperature dependence of the peak position\nw
hile the width is beyond our present possibilities.\nThe dispersion relati
on reveals different in-medium masses for longitudinal\nand transversal gl
uons at high temperatures\, in agreement with weak\ncoupling expectations.
\n\nhttps://agenda.infn.it/event/12163/contributions/12457/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12457/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A way to avoid the global sign problem by modifying the Lefschetz
thimble method
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12456@agenda.infn.it
DESCRIPTION:Speakers: Takahiro Doi (Quantum Hadron Physics Laboratory Theo
retical Research Division\, Nishina Center\, RIKEN)\nThe numerical simulat
ion for the lattice QCD at finite density is difficult to perform due to t
he sign problem. The Lefschetz thimble method is expected to give us a pos
sible solution of the sign problem. However\, this method has the global s
ign problem\, which is cancellation between thimbles\, and this problem ha
s not been solved yet. We develop a new method to avoid the global sign pr
oblem by modifying the Lefschetz thimble method. In this talk\, I introduc
e our method and show that it works well in toy models.\n\nhttps://agenda.
infn.it/event/12163/contributions/12456/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12456/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determination of deconfinement transition from Roberge-Weiss perio
dicity
DTSTART;VALUE=DATE-TIME:20170627T080500Z
DTEND;VALUE=DATE-TIME:20170627T083000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12455@agenda.infn.it
DESCRIPTION:Speakers: Kouji Kashiwa (Yukawa Institute for Theoretical Phys
ics\, Kyoto University)\nIn this talk\, I will report recent progress of o
ur study on the confinement-deconfinement transition in QCD from topologic
al view points. We have proposed a new determination of the confinement-de
confinement transition by using the imaginary chemical potential. The imag
inary chemical potential can be interpreted as the Aharonov-Bohm phase and
then an analogy of the topological order suggests that the Roberge-Weiss
endpoint would define the deconfinement temperature. Based on the topologi
cal property\, we can construct a new quantity which describes the confine
ment-deconfinement transition. This quantity is defined as the integral of
the quark number susceptibility along the closed loop of the dimensionles
s imaginary chemical potential.\n\nhttps://agenda.infn.it/event/12163/cont
ributions/12455/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12455/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulation of theories with a topological term
DTSTART;VALUE=DATE-TIME:20170626T103500Z
DTEND;VALUE=DATE-TIME:20170626T110000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12454@agenda.infn.it
DESCRIPTION:Speakers: Eduardo Follana (Universidad de Zaragoza)\nWe discus
s two methods for simulating systems with a\n"theta-like" term in the acti
on\, and that therefore suffer from a\nsevere sign problem. Both methods a
re based on simulations at\nimaginary values of the "theta-like" parameter
\, where the sign problem\nis absent. We show the results of implementing
the methods in a\nvariety of physical systems\, and we analyze their appli
cability and\nshortcomings. We also present preliminary results on the Sch
winger\nmodel with a theta term\, and we discuss the prospects for simulat
ing\nQCD with a non-zero theta angle.\n\nhttps://agenda.infn.it/event/1216
3/contributions/12454/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12454/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Color screening masses under the influence of strong background fi
elds
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12453@agenda.infn.it
DESCRIPTION:Speakers: Andrea Rucci (PI)\nI will present recent results obt
ained in the study of the color\nmagnetic and electric screening masses in
the QCD plasma.\nI will focus on how the masses get modified by strong\nm
agnetic background fields which are expected to be created\nin particular
physical contexts such as heavy-ion collisions.\n\nhttps://agenda.infn.it/
event/12163/contributions/12453/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12453/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fast Hydrodynamization of Non-conformal Holographic Shockwaves
DTSTART;VALUE=DATE-TIME:20170626T143000Z
DTEND;VALUE=DATE-TIME:20170626T145500Z
DTSTAMP;VALUE=DATE-TIME:20201021T130806Z
UID:indico-contribution-12163-12452@agenda.infn.it
DESCRIPTION:Speakers: Maximilian Attems (University of Barcelona)\nEver si
nce fast hydrodynamization has been observed in heavy ion collisions the u
nderstanding of the early out-of-equilibrium stage of such collisions has
been a topic of intense research. We use the gauge/gravity duality to mode
l the creation of a strongly coupled Quark-Gluon plasma in a non-conformal
gauge theory. This numerical relativity study is the first non-conformal
holographic simulation of a heavy ion collision and reveals the existence
of new relaxation channels due to the presence of non-vanishing bulk visco
sity. We study collisions at different energies in gauge theories with dif
ferent degrees of non-conformality and compare three relaxation times whic
h can occur in different orderings: the hydrodynamization time (when hydro
dynamics becomes applicable)\, the EoSization time (when the average press
ure approaches its equilibrium value) and the condensate relaxation time (
when the expectation value of a scalar operator approaches its equilibrium
value). We find that these processes can occur in several different order
ings. Finally\, I will discuss a new example of the applicability of hydr
odynamics to systems with large gradients. We show that the time evolutio
n and saturation of the spinodal instability (corresponding to black brane
s afflicted by the Gregory-Laflamme instability in the gravity dual) are a
ccurately described by second-order hydrodynamics\, where a set of locally
unstable states with a first-order thermal phase transition settle down t
o a static\, inhomogeneous configuration.\n\nhttps://agenda.infn.it/event/
12163/contributions/12452/
LOCATION:
URL:https://agenda.infn.it/event/12163/contributions/12452/
END:VEVENT
END:VCALENDAR