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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:20211127T050200Z
UID:indico-contribution-12473@agenda.infn.it
DESCRIPTION:Speakers: Masakiyo Kitazawa (Osaka University)\, Takumi Iritan
i (Kyoto University)\, Masayuki Asakawa (Osaka University)\, Tetsuo Hatsud
a (Phys. Dep.\, Univ. Tokyo)\nWe study the temporal correlators of energy-
momentum tensor in various channels in SU(3) gauge theory for two values o
f temperature T = 1.68T c and 2.24T c on the lattice. The correlators are
measured using energy-momentum tensor operators constructed with the gradi
ent flow\, which is found to be quite effective to reduce the statistical
error. We numerically confirm that temporal correlators including a conser
ved charge (energy or momentum) are constants as is consistent with the en
ergy-momentum conservation. It is also checked that these constants satisf
y the linear response relations. A novel measurement of specific heat from
the energy-energy correlator is performed.\nhttps://agenda.infn.it/event/
12163/contributions/12473/
URL:https://agenda.infn.it/event/12163/contributions/12473/
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:20211127T050200Z
UID:indico-contribution-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\nhttps://agenda.infn.it/event/1
2163/contributions/12465/
URL:https://agenda.infn.it/event/12163/contributions/12465/
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:20211127T050200Z
UID:indico-contribution-12452@agenda.infn.it
DESCRIPTION:Speakers: Maximilian Attems (University of Barcelona)\, Yago B
ea (University of Barcelona)\, Jorge Casalderrey Solana (University of Oxf
ord)\, David Mateos (University of Barcelona)\, Miquel Triana (University
of Barcelona)\, Zilhao Miguel (University of Barcelona)\nEver since fast h
ydrodynamization has been observed in heavy ion collisions the understandi
ng of the early out-of-equilibrium stage of such collisions has been a top
ic of intense research. We use the gauge/gravity duality to model the crea
tion of a strongly coupled Quark-Gluon plasma in a non-conformal gauge the
ory. This numerical relativity study is the first non-conformal holographi
c simulation of a heavy ion collision and reveals the existence of new rel
axation channels due to the presence of non-vanishing bulk viscosity. We s
tudy collisions at different energies in gauge theories with different deg
rees of non-conformality and compare three relaxation times which can occu
r in different orderings: the hydrodynamization time (when hydrodynamics b
ecomes applicable)\, the EoSization time (when the average pressure approa
ches its equilibrium value) and the condensate relaxation time (when the e
xpectation value of a scalar operator approaches its equilibrium value). W
e find that these processes can occur in several different orderings. Fin
ally\, I will discuss a new example of the applicability of hydrodynamics
to systems with large gradients. We show that the time evolution and satu
ration of the spinodal instability (corresponding to black branes afflicte
d by the Gregory-Laflamme instability in the gravity dual) are accurately
described by second-order hydrodynamics\, where a set of locally unstable
states with a first-order thermal phase transition settle down to a static
\, inhomogeneous configuration.\nhttps://agenda.infn.it/event/12163/contri
butions/12452/
URL:https://agenda.infn.it/event/12163/contributions/12452/
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:20211127T050200Z
UID:indico-contribution-12453@agenda.infn.it
DESCRIPTION:Speakers: Andrea Rucci (PI)\, Claudio Bonati (FI)\, Massimo D'
Elia (PI)\, Francesco Negro (PI)\, Francesco Sanfilippo (INFN - Sezione Ro
ma III)\, Michele Mesiti (PI)\nI will present recent results obtained in t
he study of the color\nmagnetic and electric screening masses in the QCD p
lasma.\nI will focus on how the masses get modified by strong\nmagnetic ba
ckground fields which are expected to be created\nin particular physical c
ontexts such as heavy-ion collisions.\nhttps://agenda.infn.it/event/12163/
contributions/12453/
URL:https://agenda.infn.it/event/12163/contributions/12453/
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:20211127T050200Z
UID:indico-contribution-12454@agenda.infn.it
DESCRIPTION:Speakers: Eduardo Follana (Universidad de Zaragoza)\, Vicente
Azcoiti (Universidad de Zaragoza)\, Giuseppe Di Carlo (LNGS)\, Alejandro V
aquero (Universidad de Zaragoza)\, Eduardo Royo (Universidad de Zaragoza)\
nWe discuss two methods for simulating systems with a\n"theta-like" term i
n the action\, and that therefore suffer from a\nsevere sign problem. Both
methods are based on simulations at\nimaginary values of the "theta-like"
parameter\, where the sign problem\nis absent. We show the results of imp
lementing the methods in a\nvariety of physical systems\, and we analyze t
heir applicability and\nshortcomings. We also present preliminary results
on the Schwinger\nmodel with a theta term\, and we discuss the prospects f
or simulating\nQCD with a non-zero theta angle.\nhttps://agenda.infn.it/ev
ent/12163/contributions/12454/
URL:https://agenda.infn.it/event/12163/contributions/12454/
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:20211127T050200Z
UID:indico-contribution-12455@agenda.infn.it
DESCRIPTION:Speakers: Kouji Kashiwa (Yukawa Institute for Theoretical Phys
ics\, Kyoto University)\, Akira Ohnishi (Yukawa Institute for Theoretical
Physics\, Kyoto University)\nIn this talk\, I will report recent progress
of our study on the confinement-deconfinement transition in QCD from topol
ogical view points. We have proposed a new determination of the confinemen
t-deconfinement transition by using the imaginary chemical potential. The
imaginary chemical potential can be interpreted as the Aharonov-Bohm phase
and then an analogy of the topological order suggests that the Roberge-We
iss endpoint would define the deconfinement temperature. Based on the topo
logical property\, we can construct a new quantity which describes the con
finement-deconfinement transition. This quantity is defined as the integra
l of the quark number susceptibility along the closed loop of the dimensio
nless imaginary chemical potential.\nhttps://agenda.infn.it/event/12163/co
ntributions/12455/
URL:https://agenda.infn.it/event/12163/contributions/12455/
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:20211127T050200Z
UID:indico-contribution-12456@agenda.infn.it
DESCRIPTION:Speakers: Takahiro Doi (Quantum Hadron Physics Laboratory Theo
retical Research Division\, Nishina Center\, RIKEN)\, Shoichiro Tsutsui (K
EK theory center)\nThe numerical simulation for the lattice QCD at finite
density is difficult to perform due to the sign problem. The Lefschetz thi
mble method is expected to give us a possible solution of the sign problem
. However\, this method has the global sign problem\, which is cancellatio
n between thimbles\, and this problem has not been solved yet. We develop
a new method to avoid the global sign problem by modifying the Lefschetz t
himble method. In this talk\, I introduce our method and show that it work
s well in toy models.\nhttps://agenda.infn.it/event/12163/contributions/12
456/
URL:https://agenda.infn.it/event/12163/contributions/12456/
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:20211127T050200Z
UID:indico-contribution-12457@agenda.infn.it
DESCRIPTION:Speakers: Ernst-Michael Ilgenfritz (JINR\, BLTP)\, Jan M. Pawl
owski (ITP\, Heidelberg University)\, Alexander Rothkopf (ITP\, Heidelberg
University)\, Anton M. Trunin (JINR\, BLTP)\nI will report on an attempt
to fix the gluon spectral functions at finite\ntemperature in Landau gauge
. Our study used a novel Bayesiann approach\nfor the extraction of non-pos
itive definite spectral functions.\nThe spectral functions are extracted a
t three different lattice spacing.\nFor each of them\, a scan of temperatu
res around the crossover transition\nis carried out.\nThere are indication
s for the existence of a well defined quasi-particle\npeak. Due to a relat
ively small number of imaginary frequencies available\,\nwe focus on the m
omentum and temperature dependence of the peak position\nwhile the width i
s beyond our present possibilities.\nThe dispersion relation reveals diffe
rent in-medium masses for longitudinal\nand transversal gluons at high tem
peratures\, in agreement with weak\ncoupling expectations.\nhttps://agenda
.infn.it/event/12163/contributions/12457/
URL:https://agenda.infn.it/event/12163/contributions/12457/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Collective Excitations in QCD Plasma
DTSTART;VALUE=DATE-TIME:20170628T083000Z
DTEND;VALUE=DATE-TIME:20170628T085500Z
DTSTAMP;VALUE=DATE-TIME:20211127T050200Z
UID:indico-contribution-12458@agenda.infn.it
DESCRIPTION:Speakers: Ali Davody (Institute of Theoretical Physics\, Regen
sburg University\, 93040 Regensburg\, Germany)\, Navid Abbasi (IPM)\, fari
d Taghavi (IPM)\, Davood Allahbakhshi (IPM)\nWe study the long wavelength
excitations in rotating QCD fluid coupled\nto an external magnetic field a
t finite vector and axial charge densities. We first find the generalizati
on of the both well-known Chiral Magnetic Wave (CMW) and Chiral Vortical W
ave (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 op
posite directions of the magnetic field with the same velocities. However
when µ5 6= 0\, one of the CMW modes propagates faster than the other and
additionally\, they do not necessarily propagate in the opposite direction
s. The similar situation happens for the two CVWs in the rotating fluid at
finite axial chemical potential. We then show that in general\, when the
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\nWave (
CMVW). The resultant coupled waves have generally different velocities com
pared to the sum of velocities of the individual waves. We also find anoth
er excitation in the QCD plasma\; the so-called Chiral Alfv´en Wave (CAW)
\, an analogue of what as recently found in a chiral fluid with single chi
rality. We specifically show that in contrast to the latter case\, the CAW
s in QCD fluid may propagate only when both the vector and axial charge de
nsities are non-vanishing. Furthermore\, while the velocity of CAWs in a c
hiral fluid with single chirality depends on the coefficient of a gravitat
ional anomaly\, we show that in QCD fluid\, it depends on the coefficients
of both chiral and gravitational anomalies.\nhttps://agenda.infn.it/event
/12163/contributions/12458/
URL:https://agenda.infn.it/event/12163/contributions/12458/
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:20211127T050200Z
UID:indico-contribution-12459@agenda.infn.it
DESCRIPTION:Speakers: Hiroshi Ohno (University of Tsukuba)\, Heng-Tong DIN
G (CCNU)\, Olaf Kaczmarek (Physics Department\, University of Bielefeld)\,
Swagato Mukherjee (Assistant Physicist)\, Hauke Sandmeyer (Bielefeld Univ
ersity)\, Hai-Tao Shu (CCNU)\nWe present our recent studies about quarkoni
um spectral functions in lattice QCD at finite temperature. We performed l
attice QCD simulations with the quenched approximation on very large and f
ine lattices. We calculated quarkonium correlation functions in a quark ma
ss range between charm and bottom quarks at temperatures between 0.75$T_c$
and 2.2$T_c$. Using the correlation functions for our finest lattice with
lattice spacing $a^-1$ = 22 GeV\, we reconstructed spectral functions\, w
here we employed the conventional maximum entropy method as well as the st
ochastic methods to check systematic uncertainties. In this talk we discus
s dissociation temperatures for charmonia and bottomonia and also show som
e estimates of the heavy quark diffusion coefficient. In addition\, we sho
w some results on a continuum extrapolation of the quarkonium correlation
functions\, which has been done for the first time\, towards the continuum
limit of the spectral functions.\nhttps://agenda.infn.it/event/12163/cont
ributions/12459/
URL:https://agenda.infn.it/event/12163/contributions/12459/
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:20211127T050200Z
UID:indico-contribution-12460@agenda.infn.it
DESCRIPTION:Speakers: Hiromichi Nishimura (BNL)\, Pisarski Robert (BNL)\,
Vladimir Skokov (BNL)\nWe use a semiclassical method to analyze the phase
structure of SU(N) gauge theory at infinite N in the presence of the exter
nal field. The effective potential can be written in terms of a Landau fr
ee energy for Polyakov loops\, and we construct it using the perturbative
contribution and a double trace deformation as the unknown confining poten
tial. We show that there is a surface of a continuous phase transition an
alogous to the Gross-Witten-Wadia transition\, whose boundary terminates a
t a tricritical point of a critical first-order phase transition. Dependi
ng on the confining potential we have considered\, it gives rise to a thir
d\, fourth\, or fifth-order phase transition in the Ehrenfest classificati
on. Because the specific heat and the eigenvalue distribution of the Poly
akov loop are sensitive to the confining potential\, we argue that lattice
simulations for large N could probe the order of phase transition as well
as the form of the confining potential in any 1+d dimensions.\nhttps://ag
enda.infn.it/event/12163/contributions/12460/
URL:https://agenda.infn.it/event/12163/contributions/12460/
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:20211127T050200Z
UID:indico-contribution-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\nhttps://agenda.infn.it/event/12163/contributions/12461/
URL:https://agenda.infn.it/event/12163/contributions/12461/
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:20211127T050200Z
UID:indico-contribution-12462@agenda.infn.it
DESCRIPTION:Speakers: Gert Aarts (Swansea University)\, Chris Allton (Swan
sea University)\, Davide de Boni (Swansea University)\, Simon Hands (Swans
ea University)\, Benjamin Jaeger (ETH Zurich)\, Jonivar Skullerud (Manynoo
th University)\nWe investigate the fate of strange baryons in the hadronic
gas and the\nquark-gluon plasma. In the confined phase a strong temperatu
re dependence\nis seen in the masses 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 quar
k. This\nstudy uses nonperturbative lattice simulations\, employing the FA
STSUM\nanisotropic Nf = 2 + 1 ensembles.\nhttps://agenda.infn.it/event/121
63/contributions/12462/
URL:https://agenda.infn.it/event/12163/contributions/12462/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.infn.it/event/12163/c
ontributions/12463/
URL:https://agenda.infn.it/event/12163/contributions/12463/
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:20211127T050200Z
UID:indico-contribution-12464@agenda.infn.it
DESCRIPTION:Speakers: Ouraman Hajizadeh (University of Graz)\, Tamer Boz (
National University of Irland\, Maynooth)\, Jonivar Skullerud (National Un
iversity of Irland\, Maynooth)\, Axel Maas (University of Graz)\nSU(2) is
the simplest non-abelian gauge theory with fermions without sign problem.
Therefore its study on the lattice is a benchmark for other non-perturbati
ve approaches at finite density.\n\nWe study the Landau-gauge 2-point and
3-point correlation functions of the gauge sector and the running gauge co
upling at finite density\, and compare them to the vacuum case.\n\nWe obse
rved no significant effect of the finite density\, except for some screeni
ng 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 ga
uge sector\, in contrast to the finite-temperature case. This indicates th
at the finite-density physics is essentially driven by the quarks\, rather
than by the gluons.\nhttps://agenda.infn.it/event/12163/contributions/124
64/
URL:https://agenda.infn.it/event/12163/contributions/12464/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD Critical Point and Hydrodynamics
DTSTART;VALUE=DATE-TIME:20170628T074000Z
DTEND;VALUE=DATE-TIME:20170628T080500Z
DTSTAMP;VALUE=DATE-TIME:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.infn.it/event/12163/contributi
ons/12474/
URL:https://agenda.infn.it/event/12163/contributions/12474/
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:20211127T050200Z
UID:indico-contribution-12466@agenda.infn.it
DESCRIPTION:Speakers: Shreyansh Shankar Dave (Institute of Physics)\, Arpa
n Das (Institute of Physics\, Bhubaneswar\, India)\, P.S. Saumia (Bogoliub
ov Laboratory of Theoretical Physics\, JINR\, Dubna)\, Ajit M. Srivastava
(Institute of Physics\, Bhubaneswar\, India)\nVery strong magnetic fields
can arise in noncentral heavyion collisions at ultra relativistic en
ergies\, which may not decay quickly in a conducting plasma. We carry out
relativistic magnetohydrodynamics (RMHD) simulations to study the effect
s of this magnetic field on the evolution of the plasma and on resulting f
low fluctuations in the ideal RMHD limit. Our results show that magnetic f
ield leads to enhancement in elliptic flow\, though in general effects of
magnetic field on elliptic flow are very complex. Interestingly\, we find
that magnetic field in localized regions can temporarily increase in time
as evolving plasma energy density fluctuations lead to reorganization of m
agnetic flux. This can have important effects on chiral magnetic effect. M
agnetic field has nontrivial effects on the power spectrum of flow fluct
uations. For very strong magnetic field case one sees a pattern of eveno
dd difference in the power spectrum of flow coefficients arising from refl
ection symmetry about the magnetic field direction if initial state fluctu
ations are not dominant. We discuss the situation of nontrivial magnetic f
ield configurations arising from collision of deformed nuclei and show tha
t it can lead to anomalous elliptic flow. Special (crossed bodybody) con
figurations of deformed nuclei collision can lead to presence of quadrupol
ar magnetic field which can have very important effects on the rapidity de
pendence of transverse expansion (similar to beam focusing from quadrupole
fields in accelerators). We also show the possibility 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
.\nhttps://agenda.infn.it/event/12163/contributions/12466/
URL:https://agenda.infn.it/event/12163/contributions/12466/
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:20211127T050200Z
UID:indico-contribution-12467@agenda.infn.it
DESCRIPTION:Speakers: Noriyuki Sogabe (Keio University)\, Naoki Yamamoto (
Keio University)\nWe study the static and dynamic critical phenomena near
the possible high-density QCD critical point in the superfluid phase of nu
clear and quark matter. In particular\, we find that its dynamic universal
ity class is different from those studied in QCD and condensed matter syst
ems so far. We argue that this novelty stems from the interplay between th
e chiral criticality and the presence of the superfluid phonon---a feature
specific for high-density QCD critical point.\nhttps://agenda.infn.it/eve
nt/12163/contributions/12467/
URL:https://agenda.infn.it/event/12163/contributions/12467/
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:20211127T050200Z
UID:indico-contribution-12468@agenda.infn.it
DESCRIPTION:Speakers: Jarno Rantaharju (Duke University)\, Shailesh Chandr
asekharan (Duke University)\, Venkitesh Ayyar (University of Colorado\, Bo
ulder)\nWe present a study of the finite density lattice Thirring model in
2 dimensions using the world-line/fermion-bag algorithm. The model has fe
atures similar to QCD and provides a test case to explore the accuracy of
various methods to solve sign problems. In the massless limit and with ope
n boundary conditions we show that the sign problem is an artifact of the
auxiliary field approach and is completely eliminated in the world-line ap
proach. With anti-periodic boundary conditions the sign problem is mild on
square lattices in the fermion bag method. We present accurate results fo
r various quantities in the model that can be used as a benchmark for comp
arison with other methods of solving sign problems.\nhttps://agenda.infn.i
t/event/12163/contributions/12468/
URL:https://agenda.infn.it/event/12163/contributions/12468/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.infn.it/event/12163/contributions
/12469/
URL:https://agenda.infn.it/event/12163/contributions/12469/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.i
nfn.it/event/12163/contributions/12470/
URL:https://agenda.infn.it/event/12163/contributions/12470/
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:20211127T050200Z
UID:indico-contribution-12471@agenda.infn.it
DESCRIPTION:Speakers: Akio Tomiya (CCNU)\, Heng-Tong DING (Bielefeld Unive
rsity)\, Swagato Mukherjee (Assistant Physicist)\, Christian Schmidt (Fran
kfurt Institute for Advanced Studies)\nLattice simulations for (2+1)-flavo
r QCD demonstrated that the quark mass is one of the important parameters
responsible for the (inverse)-magnetic catalysis. In this talk we will dis
cuss the dependence of chiral condensates and susceptibilities on the magn
etic field in three flavor QCD in the regime of the first order phase tran
sition. The lattice simulations were performed using standard staggered fe
rmions and the plaquette action with spatial sizes $N_s$ = 16 and 24 and
a fixed temporal size $N_t$ = 4. The value of the quark mass was chosen su
ch \nthat the system undergoes a first order chiral phase transition with
zero magnetic field.\nWe find that the quark chiral condensate undergoes
magnetic catalysis in the whole temperature region\, and the first order p
hase transition becomes stronger as magnetic field increases. The underlyi
ng mechanism will also be discussed.\nhttps://agenda.infn.it/event/12163/c
ontributions/12471/
URL:https://agenda.infn.it/event/12163/contributions/12471/
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:20211127T050200Z
UID:indico-contribution-12472@agenda.infn.it
DESCRIPTION:Speakers: Asobu Suzuki (University of Tsukuba)\, Yusuke Tanigu
chi (University of Tsukuba)\n$B_{K}$ is a parameter which is related with
the Kaon mixing and is one of the targets of Lattice QCD.\nNaive calculati
on of $B_{K}$ with the Wilson fermion is difficult because the chiral sym
metry is explicitly broken.\nIn this study we shall present on our calcula
tion of $B_{K}$ with the Wilson fermion by applying the gradient flow meth
od 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 Wilso
n fermion and take the continuum limit without bothering the UV divergence
.\nThis property is already observed for practical numerical simulation in
Phys. Rev. D 95\, 054502 (2017)\, where the chiral Ward-Takahashi relatio
n is effectively restored for the topological susceptibility.\nIn our stud
y we expect the same good property even for the four fermi operators used
for $B_{K}$.\nhttps://agenda.infn.it/event/12163/contributions/12472/
URL:https://agenda.infn.it/event/12163/contributions/12472/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps:
//agenda.infn.it/event/12163/contributions/12475/
URL:https://agenda.infn.it/event/12163/contributions/12475/
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:20211127T050200Z
UID:indico-contribution-12476@agenda.infn.it
DESCRIPTION:Speakers: Kazuyuki Kanaya (University of Tsukuba)\, Shinji Eji
ri (Niigata University)\, Ryo Iwami (Niigata Univ.)\, Masakiyo Kitazawa (O
saka University)\, Hiroshi Suzuki (Kyushu Univ.)\, Yusuke Taniguchi (Unive
rsity of Tsukuba)\, Takashi Umeda (Hiroshima Univ.)\nThe energy-momentum t
ensor and the chiral condensate are studied in (2+1)-flavor QCD with impro
ved Wilson quarks at the physical point\, applying the method of Makino an
d 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 Iwasaki 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 b
ased on the fixed-scale approach using zero-temperature physical point con
figurations generated by the PACS-CS Collaboration. We present preliminary
results on the equation of state and the chiral condensate obtained so fa
r.\nhttps://agenda.infn.it/event/12163/contributions/12476/
URL:https://agenda.infn.it/event/12163/contributions/12476/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.infn.it/event/1
2163/contributions/12477/
URL:https://agenda.infn.it/event/12163/contributions/12477/
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:20211127T050200Z
UID:indico-contribution-12478@agenda.infn.it
DESCRIPTION:Speakers: Roman Höllwieser (VUT)\, Jeff Greensite (San Franci
sco State University)\nWe suggest to solve the sign problem by mapping ful
l QCD to an effective Polyakov line model. \nThe method of relative weight
s\, coupled with mean field theory\, is applied to derive an effective act
ion for an underlying SU(3) gauge theory with dynamical staggered fermions
at finite densities. We present first results and discuss issues so far
encountered.\nhttps://agenda.infn.it/event/12163/contributions/12478/
URL:https://agenda.infn.it/event/12163/contributions/12478/
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:20211127T050200Z
UID:indico-contribution-12479@agenda.infn.it
DESCRIPTION:Speakers: Rajamani Narayanan (Florida International University
)\, Nikhil Karthik (Florida International University)\nRecent numerical re
sults on QED and QCD with massless fermions in three dimensions will be pr
esented. The main focus will be classifying theories as conformal or non-c
onformal. Results for the absence or presence of bilinear condensates will
be presented using the behavior of low lying eigenvalues. Correlation fun
ctions of fermion bilinears will also be presented.\nhttps://agenda.infn.i
t/event/12163/contributions/12479/
URL:https://agenda.infn.it/event/12163/contributions/12479/
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:20211127T050200Z
UID:indico-contribution-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].\nhttps://
agenda.infn.it/event/12163/contributions/12480/
URL:https://agenda.infn.it/event/12163/contributions/12480/
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:20211127T050200Z
UID:indico-contribution-12481@agenda.infn.it
DESCRIPTION:Speakers: Simone Biondini (Albert Einstein Center\, Institute
for Theoretical Physics - Uni Bern)\, Nora Brambilla (Technische Universit
aet Muenchen)\, Antonio Vairo (Technische Universitaet Muenchen)\, Miguel
Escobedo (Department of Physics\, University of Jyvaskyla\, Finland)\nIn t
he early stages of heavy-ion collisions\, the hot QCD matter expands more
longitudinally than transversely.\nThis imbalance causes the system to bec
ome rapidly colder in the longitudinal direction and a local momentum anis
otropy appears. \nIn this talk we study the heavy-quarkonium spectrum in t
he presence of a small plasma anisotropy. \nWe work in the framework of po
tential non-relativistic QCD at finite temperature.\nWe inspect arrangemen
ts of non-relativistic and thermal scales complementary to those considere
d in the literature. \nIn particular\, we consider temperatures larger and
Debye masses smaller than the binding energy\, \nwhich is a temperature r
ange relevant for presently running LHC experiments.\nIn this setting we c
ompute the leading thermal corrections to the binding energy and the therm
al width induced by quarkonium gluo-dissociation\nhttps://agenda.infn.it/e
vent/12163/contributions/12481/
URL:https://agenda.infn.it/event/12163/contributions/12481/
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:20211127T050200Z
UID:indico-contribution-12482@agenda.infn.it
DESCRIPTION:Speakers: Shailesh Chandrasekharan (Duke University)\, Emilie
Huffman (Duke University)\nHamiltonian lattice field theories provide an a
lternate approach to study traditional Lagrangian lattice field theories i
n the strongly interacting regime. These formulations are more commonly us
ed in condensed matter physics and may be more natural in theories at fini
te densities. They can be formulated both in discrete and continuous time.
In the continuous time formulation they can help in reducing the fermion
doubling problem. Some new sign problems are also solvable within this app
roach. In the discrete time formulation they are very similar to tradition
al Lagrangian lattice field theories but with unconventional actions. Unfo
rtunately\, traditional Monte Carlo methods for Hamiltonian lattice field
theories seem to scale rather poorly with system size. Here we show that b
y using ideas of fermion bags we can 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 critical exponents of the 2+1d Gross-Neve
u model with Nf=1\, which was impossible so far in Lagrangian lattice fiel
d theory.\nhttps://agenda.infn.it/event/12163/contributions/12482/
URL:https://agenda.infn.it/event/12163/contributions/12482/
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:20211127T050200Z
UID:indico-contribution-12483@agenda.infn.it
DESCRIPTION:Speakers: Tamaz Khunjua (Moscow State University M.V. Lomonoso
v)\, Konstantin Klimenko (State Research Center of Russian Federation –
Institute for High Energy Physics\, NRC "Kurchatov Institute"\, Protvino\,
Russia)\nWe investigate the phase structure of a (1+1)-dimensional schema
tic quark model with four-quark interaction and in the presence of baryon
(μB)\, isospin (μI) and chiral isospin (μI5) chemical potentials. It is
established that in the large-Nc limit (Nc is the number of colored quark
s) there exists a duality correspondence between the chiral symmetry break
ing phase and the charged pion condensation (PC) one. The role and influen
ce of this property on the phase structure of the model are studied. It i
s also shown that the chemical potential μI5 promotes the appearance of t
he charged PC phase with nonzero baryon density. Spatially inhomogeneous c
hiral density wave (for chiral condensate) and single wave (for charged pi
on condensate) approaches are also used.\nhttps://agenda.infn.it/event/121
63/contributions/12483/
URL:https://agenda.infn.it/event/12163/contributions/12483/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological susceptibility and Gribov copies
DTSTART;VALUE=DATE-TIME:20170626T152000Z
DTEND;VALUE=DATE-TIME:20170626T152000Z
DTSTAMP;VALUE=DATE-TIME:20211127T050200Z
UID:indico-contribution-12484@agenda.infn.it
DESCRIPTION:Speakers: Caroline Felix (KU Leuven)\, David Dudal (KU Leuven)
\, Marcelo Guimarães (UERJ)\, Silvio Sorella (UERJ)\nThe topological susc
eptibility\, $\\chi^4$\, 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
correlation function of the topological current $K_{\\mu}$ correlator. The
re was a recent attempt in http://inspirehep.net/record/1340323?ln=\nen to
connect the dynamics of the Veneziano ghost\, and thus topological susce
ptibility\, with Gribov copies. However\, we will discuss that this propos
al is incompatible with BRST symmetry\, following http://inspirehep.net/re
cord/1402613?ln=en. We will also analyze the topological susceptibility in
$SU(2)$ and $SU(3)$ Euclidean Yang-Mills theory in a generic linear covar
iant gauge taking into account the Gribov ambiguity\, while keeping the BR
ST symmetry. During this analysis\, we make use of a Pad{\\' e} approximat
ion based on the K\\"all\\'en-Lehmann spectral integral representation of
the topological current correlation function.\nhttps://agenda.infn.it/even
t/12163/contributions/12484/
URL:https://agenda.infn.it/event/12163/contributions/12484/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.infn.it/event/12163/contributions/12485/
URL:https://agenda.infn.it/event/12163/contributions/12485/
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:20211127T050200Z
UID:indico-contribution-12486@agenda.infn.it
DESCRIPTION:Speakers: Francesco Sanfilippo (INFN - Sezione Roma III)\, Mas
simo D'Elia (PI)\, Giuseppe Gagliardi (Università di Pisa)\nI present a d
etermination of the cumulants of the quark number fluctuations\, obtained
via analytic continuation of Nf=2+1 physical quark mass lattice QCD simula
tions at imaginary chemical potentials. We employ stout improved staggered
fermions and tree level Symanzik gauge action\, exploring temperatures ra
nging 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 the possible
location of the second order critical point at real potential. No evidenc
e for such a point is found in the explored range of temperature\, within
present determinations of the pseudo-critical line.\nhttps://agenda.infn.i
t/event/12163/contributions/12486/
URL:https://agenda.infn.it/event/12163/contributions/12486/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.infn.it/event/12163/contributions/12487
/
URL:https://agenda.infn.it/event/12163/contributions/12487/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.infn.it/event/12163/contributions/12488/
URL:https://agenda.infn.it/event/12163/contributions/12488/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.infn.it
/event/12163/contributions/12489/
URL:https://agenda.infn.it/event/12163/contributions/12489/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Welcome and Introduction
DTSTART;VALUE=DATE-TIME:20170626T070000Z
DTEND;VALUE=DATE-TIME:20170626T072000Z
DTSTAMP;VALUE=DATE-TIME:20211127T050200Z
UID:indico-contribution-12490@agenda.infn.it
DESCRIPTION:https://agenda.infn.it/event/12163/contributions/12490/
URL:https://agenda.infn.it/event/12163/contributions/12490/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.infn.it/event/12163/contributions/12491/
URL:https://agenda.infn.it/event/12163/contributions/12491/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.infn.it/event/12163/contributions/12508/
URL:https://agenda.infn.it/event/12163/contributions/12508/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://ag
enda.infn.it/event/12163/contributions/12492/
URL:https://agenda.infn.it/event/12163/contributions/12492/
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:20211127T050200Z
UID:indico-contribution-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.\nht
tps://agenda.infn.it/event/12163/contributions/12493/
URL:https://agenda.infn.it/event/12163/contributions/12493/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.infn.it/event/12163/contributions/12494/
URL:https://agenda.infn.it/event/12163/contributions/12494/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.infn.it/event/12163
/contributions/12495/
URL:https://agenda.infn.it/event/12163/contributions/12495/
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:20211127T050200Z
UID:indico-contribution-12496@agenda.infn.it
DESCRIPTION:Speakers: Souvik Priyam Adhya (Post doctoral fellow)\, Pradip
Kumar Roy (Saha Institute of Nuclear Physics)\nIn this work\, the self en
ergies of $\\pi_0$ and $\\pi_{\\pm}$ up to one loop order have been calcul
ated in the limit of weak\nexternal magnetic field . The effective\nmasses
get an explicit magnetic field dependence which are modified significantl
y for the pseudo-scalar coupling due to weak field approximation of the ex
ternal field. However\, for the pseudo-vector coupling\, only a modest red
uction in the effective masses are noted. These theoretical developments a
re relevant for the study of the phenomenological aspect of mesons in the
context of neutron stars as well as heavy ion collisions.\nhttps://agenda.
infn.it/event/12163/contributions/12496/
URL:https://agenda.infn.it/event/12163/contributions/12496/
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:20211127T050200Z
UID:indico-contribution-12498@agenda.infn.it
DESCRIPTION:Speakers: Jens Oluf Andersen (NTNU)\, Michael Strickland (kent
State)\, Najmul Haque (giessen)\, Mustafa munshi (Saha Institute)\nThe pe
rturbative series for finite-temperature field theories has very poor conv
ergence properties and one needs a way to reorganize it. In this talk\, I
review \none way of reorganizing the perturbative series thermal QCD\, \nn
amely hard-thermal-loop perturbation theory (HTLpt).\nI will present resul
ts for the pressure\, trace anomaly\, speed of sound and the quark suscept
ibilities from a 3-loop HTLpt calculation.\nA careful comparison with avai
lable lattice data shows good agreement for a number of physical quantitie
s.\nhttps://agenda.infn.it/event/12163/contributions/12498/
URL:https://agenda.infn.it/event/12163/contributions/12498/
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:20211127T050200Z
UID:indico-contribution-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
.\nhttps://agenda.infn.it/event/12163/contributions/12517/
URL:https://agenda.infn.it/event/12163/contributions/12517/
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:20211127T050200Z
UID:indico-contribution-12499@agenda.infn.it
DESCRIPTION:Speakers: Ángel Gómez Nicola (Universidad Complutense Madrid
)\, Jacobo Ruiz de Elvira (HISKP\, Bonn University)\nThe nature of chiral
symmetry restoration and the identification of its correct pattern in ter
ms of $O(4)$ and $U(1)_A$ restoration are central problems for our presen
t understanding of the QCD phase diagram\, which are not fully settled in
lattice simulations. We will present a theoretical analysis based on Wa
rd Identities which sheds light on this issue and where partner degenerat
ion is systematically studied and connected with physical processes for th
e full scalar/pseudoscalar $U(3)$ meson nonets. Model-independent result
s are derived\, which in addition allow to understand the temperature
dependence of lattice screening masses through particular quark condensate
combinations. Their realization in $U(3)$ Chiral perturbation Theory will
also be described. Special attention will be paid to the role of the t
hermal $f_0(500)$ state to describe lattice data for the scalar susceptib
ility through thermal corrections to its pole parameters generated fro
m unitarized pion scattering.\nhttps://agenda.infn.it/event/12163/contribu
tions/12499/
URL:https://agenda.infn.it/event/12163/contributions/12499/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thimble regularization 5 years later
DTSTART;VALUE=DATE-TIME:20170626T080000Z
DTEND;VALUE=DATE-TIME:20170626T082500Z
DTSTAMP;VALUE=DATE-TIME:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.infn.it/even
t/12163/contributions/12500/
URL:https://agenda.infn.it/event/12163/contributions/12500/
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:20211127T050200Z
UID:indico-contribution-12501@agenda.infn.it
DESCRIPTION:Speakers: Benjamin Jaeger (ETH Zurich)\, Philippe de Forcrand
(ETH Zurich &\; CERN)\nSeveral important observables\, like the quark c
ondensate and the Taylor coefficients of the QCD pressure with respect to
the chemical potential\, are based on the trace of the inverse Dirac opera
tor or its powers. Such traces are traditionally estimated with "noise vec
tors". We explore alternative approaches based on polynomial approximation
s of the inverse Dirac operator.\nhttps://agenda.infn.it/event/12163/contr
ibutions/12501/
URL:https://agenda.infn.it/event/12163/contributions/12501/
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:20211127T050200Z
UID:indico-contribution-12502@agenda.infn.it
DESCRIPTION:Speakers: Pavel Buividovich (Regensburg University)\, Ali Davo
dy (Regensburg University)\nWe demonstrate that non-Abelian lattice field
theories such as principal chiral model and pure lattice gauge theory in t
he large-N limit admit infrared-finite weak-coupling expansion in powers o
f coupling and logs of coupling\, reminiscent of re-summed series in therm
al field theory and resurgent trans-series without exponential terms. Such
a double-series structure arises due to the bare mass term proportional t
o the coupling constant\, which stems from the Jacobian in the path integr
al measure and is absent in the scale-invariant classical action. This ter
m renders the perturbative expansion infrared-finite even for an infinite
lattice size\, which allows to sample it using Diagrammatic Monte-Carlo. O
n the exactly solvable example we demonstrate that this expansion incorpor
ates the non-perturbative mass gap. We then develop a DiagMC algorithm for
sampling planar diagrams in the principal chiral model and numerically de
monstrate the convergence of our expansion for up to 12 leading orders\, w
hich is the practical limit set by the increasingly strong sign problem at
high orders. We find reasonably good agreement with conventional Monte-Ca
rlo\, extrapolated to infinite N. Finally\, we comment on the applicabilit
y of our approach to planar QCD at zero and finite density.\nhttps://agend
a.infn.it/event/12163/contributions/12502/
URL:https://agenda.infn.it/event/12163/contributions/12502/
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:20211127T050200Z
UID:indico-contribution-12503@agenda.infn.it
DESCRIPTION:Speakers: Victor Braguta (ITEP)\, Andrey Kotov (Institute for
Theoretical and Experimental Physics)\, Nikita Astrakhantsev (ITEP)\nThis
report is devoted to the study of temperature dependence of bulk\nviscosit
y in SU(3)-gluodynamics. To calculate bulk viscosity we\nmeasured the corr
elation function of the trace anomaly for a set of\ntemperatures in the re
gion T/T_c \\in (0.9\, 1.5). We used multilevel\nalgorithm which allowed u
s to improve the accuracy of the data. To\nextract the values of bulk visc
osity we used two approaches: fitting\nof the data by physically motivated
ansatz and the Backus-Gilbert\nmethod.\nhttps://agenda.infn.it/event/1216
3/contributions/12503/
URL:https://agenda.infn.it/event/12163/contributions/12503/
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:20211127T050200Z
UID:indico-contribution-12504@agenda.infn.it
DESCRIPTION:Speakers: Mohamed Anber (Lewis & Clark College)\nTBD\nhttps://
agenda.infn.it/event/12163/contributions/12504/
URL:https://agenda.infn.it/event/12163/contributions/12504/
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:20211127T050200Z
UID:indico-contribution-12505@agenda.infn.it
DESCRIPTION:Speakers: Matteo Buzzegoli (FI)\, Eduardo Grossi (University o
f Florence &\; INFN Florence)\, Francesco Becattini (FI)\nThe quark-glu
on plasma created in heavy ion collisions can be described as a\nrelativis
tic fluid with high values of acceleration and vorticity and\, in such\nex
treme local equilibrium conditions\, the standard hydrodynamic equations a
re\nexpected to receive corrections from the non-ideal non-dissipative ter
ms of the\nstress-energy tensor. \n\nWe show how these corrections can be
obtained in a systematical way by\nperforming a perturbative expansion ar
ound the homogeneous global equilibrium\ncondition for small values of acc
eleration and vorticity. The final outcome is\nthat the thermodynamic coef
ficients associated with these corrections can be\nexpressed in term of eu
clidean correlators of the stress-energy tensor operator\nand the generato
rs of the Lorentz group.\n\nThese correlators can in principle be estimate
d nonperturbatively by lattice\nQCD techniques and we will present the ana
lytic results that can be obtained in\ntwo cases: a free scalar charged fi
eld and a free Dirac field\, both massive\nand massless.\nhttps://agenda.i
nfn.it/event/12163/contributions/12505/
URL:https://agenda.infn.it/event/12163/contributions/12505/
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:20211127T050200Z
UID:indico-contribution-12506@agenda.infn.it
DESCRIPTION:Speakers: Yusuke Taniguchi (University of Tsukuba)\, Shinji Ej
iri (Niigata University)\, Kazuyuki Kanaya (University of Tsukuba)\, Masak
iyo Kitazawa (Osaka University)\, Asobu Suzuki (Univesity of Tsukuba)\, Hi
roshi Suzuki (Kyushu University)\, Takashi Umeda (Hiroshima Univ.)\nWe mea
sure correlation functions of energy-momentum tensor in Nf=2+1 full QCD at
finite temperature\nby applying the gradient flow method both to the gaug
e and quark fields.\nOur main interest is to study the conservation law of
the energy-momentum tensor and\nto extract thermodynamical quantities fro
m the correlation function.\nWe adopt a fine lattice spacing a=0.07 (fm) a
nd cover a wide range of temperature region\n$174\\le T\\le697$ MeV.\nThe
ud quark mass is rather heavy with $m_{\\pi}/m_{\\rho}\\simeq0.63$ while t
he s quark mass is set to approximately its physical value.\nhttps://agend
a.infn.it/event/12163/contributions/12506/
URL:https://agenda.infn.it/event/12163/contributions/12506/
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:20211127T050200Z
UID:indico-contribution-12507@agenda.infn.it
DESCRIPTION:Speakers: Francesco Negro (PI)\, Massimo D'Elia (PI)\, Claudio
Bonati (FI)\, Francesco Sanfilippo (INFN - Sezione Roma III)\, Andrea Ruc
ci (PI)\, Salvatore Cali (University of Wuppertal and University of Cyprus
)\nWe study the confining flux tube between two static color sources and i
ts scaling towards the continuum limit in Nf=2+1 QCD at the physical point
.\nTo this aim\, we discretize the theory with the tree level Symanzik gau
ge action and stout-smearing improved staggered quarks. We discuss the eff
ect of a uniform external magnetic field on the flux tube and we show\, in
particular\, that it displays anisotropies with respect to the magnetic f
ield direction.\nhttps://agenda.infn.it/event/12163/contributions/12507/
URL:https://agenda.infn.it/event/12163/contributions/12507/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://agend
a.infn.it/event/12163/contributions/12509/
URL:https://agenda.infn.it/event/12163/contributions/12509/
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:20211127T050200Z
UID:indico-contribution-12510@agenda.infn.it
DESCRIPTION:Speakers: Yoshifumi Nakamura (RIKEN)\, Shinji TAKEDA (Kanazawa
University)\, Xiaoyong Jin (Argonne National Laboratory)\, Akira Ukawa (R
IKEN)\, Yoshinobu Kuramashi (University of Tsukuba)\nWe investigate the cr
itical endpoints of the finite temperature\nphase transition of QCD at zer
o chemical potential.\nWe employ the renormalization-group improved Iwasak
i gauge action and\nnon-perturbatively $O(a)$-improved Wilson-clover ferm
ion action.\nThe critical endpoints are determined by using the intersecti
on point of kurtosis\,\nemploying the multi-parameter\, multi-ensemble rew
eighting method.\nWe present results for the critical endline at $N_t=6$ a
nd the continuum extrapolation\nfor the critical endpoint of the SU(3)-fla
vor symmetric point.\nhttps://agenda.infn.it/event/12163/contributions/125
10/
URL:https://agenda.infn.it/event/12163/contributions/12510/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.infn.it/event/12163/contributions
/12511/
URL:https://agenda.infn.it/event/12163/contributions/12511/
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:20211127T050200Z
UID:indico-contribution-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.\nhttps://agenda.infn.it/event/12163/contributions/12512/
URL:https://agenda.infn.it/event/12163/contributions/12512/
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:20211127T050200Z
UID:indico-contribution-12513@agenda.infn.it
DESCRIPTION:Speakers: Andrey Kotov (Institute for Theoretical and Experime
ntal Physics)\, Victor Braguta (ITEP)\, Denis Boyda (FEFU)\, Mikhail Katsn
elson (Radboud University)\nRecently discovered Dirac Semimetals Na3Bi and
Cd3As2 provide\nperfect opportunity for investigation of phenomena which\
nwere usually attibuted to high energy physics. The reason for this\nis th
e existence of two massless Dirac fermions in the quasi-particle\ndispersi
on relation for these materials.\nOne of the manifestations of the chiral
anomaly\, Chiral Magnetic Effect\,\ncan be be observed in these materials
as a large magnetoconductivity.\nWe study the conductivity of these materi
als in external magnetic field\nwithin lattice effective field theory appr
oach.\nOur results confirm the existence of Chiral Magnetic Effect in Dira
c Semimetals.\nhttps://agenda.infn.it/event/12163/contributions/12513/
URL:https://agenda.infn.it/event/12163/contributions/12513/
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:20211127T050200Z
UID:indico-contribution-12514@agenda.infn.it
DESCRIPTION:Speakers: Kevin Zambello (P)\, Massimo D'Elia (PI)\, Francesco
Negro (PI)\, Michele Mesiti (PI)\, Francesco Sanfilippo (INFN - Sezione R
oma III)\, Claudio Bonati (FI)\nWe study the curvature of the pseudo-criti
cal line in N_f=2+1 QCD through numerical simulations performed using the
tree-level Symanzik gauge action and the stout-smeared staggered action. T
he location of the phase transition is determined from the inflection poin
t of the renormalized chiral condensate and the curvature coefficient is c
alculated using the Taylor expansion adopting various definitions. We also
compare our findings with previous results available in the literature.\n
https://agenda.infn.it/event/12163/contributions/12514/
URL:https://agenda.infn.it/event/12163/contributions/12514/
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:20211127T050200Z
UID:indico-contribution-12515@agenda.infn.it
DESCRIPTION:Speakers: Atsushi Nakamura (FEFU)\, Vitaly Bornyakov (ITEP)\,
Vladimir Goy (FEFU)\, Alexander Nikolaev (FEFU)\, Denis Boyda (FEFU)\, Ale
xander Molochkov (FEFU)\, Valentin Zakharov (ITEP/FEFU)\nCanonical approac
h 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\, where Z_n\, the canonical partition functions\, do not depend on ¥m
u. We construct 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 must fight against the overlap problem\, we need several algorith
mic and computational tricks\, such as a multi-precision calculation. \nI
n Vladivostok\, we have investigated the sources of unstable Z_n\, and de
veloped methods to overcome them. I will report these studies and the out
comes\, especially those for comparison of heavy ion collision experiment.
\nhttps://agenda.infn.it/event/12163/contributions/12515/
URL:https://agenda.infn.it/event/12163/contributions/12515/
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:20211127T050200Z
UID:indico-contribution-12516@agenda.infn.it
DESCRIPTION:Speakers: Aleksandr Nikolaev (ITEP & FEFU)\, Andrey Kotov (ITE
P)\, Alexander Molochkov (FEFU)\, Roman Rogalyov (IHEP)\, Vitaly Bornyakov
(IHEP)\, Victor Braguta (ITEP)\, Ernst-Michael Ilgenfritz (JINR Dubna\, B
LTP)\, Ilya Kudrov (ITEP)\nIn this report we study the properties of the d
ense SU(2) QCD. The\nlattice simulations are carried out with improved gau
ge action and\nsmaller lattice spacing as compared to our previous work. T
his allowed us to approach closer to the continuum limit and reach larger
densities without lattice artifacts. We measured string tension and Polyak
ov loop as functions of chemical potential and temperature. At sufficientl
y large baryon density and zero temperature we observe confinement/deconfi
nement transition which manifests itself as a vanishing of the string tens
ion and rising of the Polyakov loop.\nhttps://agenda.infn.it/event/12163/c
ontributions/12516/
URL:https://agenda.infn.it/event/12163/contributions/12516/
END:VEVENT
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:20211127T050200Z
UID:indico-contribution-12518@agenda.infn.it
DESCRIPTION:Speakers: Mubarak Alqahtani (Kent State University)\, Michael
Strickland (Kent State University)\nWe present the first comparisons of ex
perimental data with phenomenological results from 3+1d quasiparticle anis
otropic hydrodynamics (aHydroQP). We compare charged-hadron multiplicity\
, identified-particle spectra\, identified-particle average transverse mom
entum\, charged-particle elliptic flow\, and identified-particle elliptic
flow produced in LHC 2.76 TeV Pb+Pb collisions. The dynamical equations u
sed for the hydrodynamic stage utilize non-conformal aHydroQP. The result
ing aHydroQP framework naturally includes both shear and bulk viscous effe
cts in addition to higher-order non-linear transport coefficients. The 3+
1d aHydroQP evolution obtained is self-consistently converted to hadrons u
sing anisotropic Cooper-Frye freezeout performed on a fixed-energy-density
hypersurface. The final production and decays of the primordial hadrons
are modeled using a customized version of THERMINATOR 2. In this first st
udy\, we utilized smooth Glauber-type initial conditions and a single effe
ctive freeze-out temperature $T_{\\rm FO} = 130$ MeV with all hadronic spe
cies in full chemical equilibrium. With this rather simple setup\, we fin
d a very good description of many heavy-ion observables.\nhttps://agenda.i
nfn.it/event/12163/contributions/12518/
URL:https://agenda.infn.it/event/12163/contributions/12518/
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