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SUMMARY:Holographic description of quarkonium dissociation in nonequilibri
um strongly interacting matter
DTSTART;VALUE=DATE-TIME:20180516T132000Z
DTEND;VALUE=DATE-TIME:20180516T134000Z
DTSTAMP;VALUE=DATE-TIME:20200330T205322Z
UID:indico-contribution-264326-2869963@indico.cern.ch
DESCRIPTION:Speakers: Pietro Colangelo (Universita e INFN\, Bari (IT))\nTh
e real-time dissociation of the heavy quarkonium in a strongly coupled boo
st-invariant non-Abelian plasma relaxing towards equilibrium is analyzed i
n a holographic framework. The effects driving the plasma out of equilibri
um are described by boundary quenching\, impulsive variations of the bound
ary metric. Quarkonium is represented by a classical string with endpoints
kept close to the boundary. The evolution of the string profile is comput
ed in the time-dependent geometry\, and the dissociation time is evaluated
for different configurations with respect to the direction of the plasma
expansion.\n\nhttps://indico.cern.ch/event/656452/contributions/2869963/
LOCATION:Palazzo del Casinò Sala Mosaici-1\, 3rd Floor
URL:https://indico.cern.ch/event/656452/contributions/2869963/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Applications of deep learning in relativistic hydrodynamics
DTSTART;VALUE=DATE-TIME:20180516T130000Z
DTEND;VALUE=DATE-TIME:20180516T132000Z
DTSTAMP;VALUE=DATE-TIME:20200330T205322Z
UID:indico-contribution-264326-2869962@indico.cern.ch
DESCRIPTION:Speakers: Hengfeng Huang (Peking University)\nDeep learning is
one of the machine learning technologies developed in computer science. R
ecently\, it has been implemented to various research areas in physics\, i
ncluding search of gravitational lens [1]\, identifying and classifying th
e phases of Ising model [2]\, the search of Higgs and exotic particles [3]
\, classification jet structure [4]\, etc. In this talk\, we will implemen
t deep learning to relativistic hydrodynamics\, which is a useful tool to
simulate the evolution of relativistic systems in high energy nuclear phys
ics and astrophysics [5].\n\nUsing 10000 initial and final energy density
and flow velocity profiles generated from 2+1-d hydrodynamics with MC-Glau
ber initial conditions\, we train the network and use it to predict the fi
nal profiles associated with various initial conditions\, including MC-Gla
uber\, MC-KLN and AMPT and TRENTo. A comparison with the hydrodynamic calc
ulations shows that the network predictions can nicely capture the magnitu
de and inhomogeneous structures of these final profiles\, as well as the r
elated eccentricity distributions $P(\\varepsilon_n)$ (n=2\, 3\, 4). These
results indicate that deep learning can capture the main feature of the n
on-linear evolution of hydrodynamics\, which shows the potential of largel
y accelerate the simulations of relativistic hydrodynamics.\n\nReference\n
[1] Y. D. Hezaveh\, et.al.\, Nature 548\, 555 (2017).\n[2] J. Carrasquilla
and G. R. Melko\, Nature Phys. 13\, 431 (2017).\n[3] P. Baldi\, et.al\, N
ature Commun. 5\, 4308 (2014).\n[4] P. T. Komiske\, et. al.\, JHEP 1701\,
110 (2017).\n[5] H. Huang\, B. Xiao\, H. Xiong\, Z. Wu\, Y. Mu and H. Song
\, in preparation.\n\nhttps://indico.cern.ch/event/656452/contributions/28
69962/
LOCATION:Palazzo del Casinò Sala Mosaici-1\, 3rd Floor
URL:https://indico.cern.ch/event/656452/contributions/2869962/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Particle production in high energy collisions: from high to low pt
and back
DTSTART;VALUE=DATE-TIME:20180516T134000Z
DTEND;VALUE=DATE-TIME:20180516T140000Z
DTSTAMP;VALUE=DATE-TIME:20200330T205322Z
UID:indico-contribution-264326-2869961@indico.cern.ch
DESCRIPTION:Speakers: Jamal Jalilian-Marian (Baruch College)\nWe describe
a new approach to particle production in high energy hadronic/nuclear coll
isions which aims to unify the Color Glass Condensate (CGC) formalism at l
ow x (low pt) with that of pQCD and collinear factorization formalism at i
ntermediate to large x (high pt) and therefore generalizes the CGC formali
sm to include high pt physics. To this end we consider scattering of a qua
rk from high x modes of the target hadron or nucleus in addition to (all-o
rder) scattering from the usual soft color field describing the low x mode
s. We derive an analytical expression for the quark propagator which inclu
des longitudinal momentum exchange with the target and allows for large an
gle deflection of the projectile quark. This quark propagator is then used
to compute the Leading Order DIS structure functions F2 and F_L in the ge
neral kinematics 0 \n\nhttps://indico.cern.ch/event/656452/contributions/2
869961/
LOCATION:Palazzo del Casinò Sala Mosaici-1\, 3rd Floor
URL:https://indico.cern.ch/event/656452/contributions/2869961/
END:VEVENT
BEGIN:VEVENT
SUMMARY:All-opacity gluon spectrum for jet physics at the EIC
DTSTART;VALUE=DATE-TIME:20180516T140000Z
DTEND;VALUE=DATE-TIME:20180516T142000Z
DTSTAMP;VALUE=DATE-TIME:20200330T205322Z
UID:indico-contribution-264326-2869955@indico.cern.ch
DESCRIPTION:Speakers: Matthew Sievert (Los Alamos National Laboratory)\nTh
e cross-sections and substructure of jets in eA reactions in a\nfuture ele
ctron-ion collider (EIC) are expected to be modified\ncompared to the vacu
um. At leading order in the strong\ncoupling\, a jet produced at an EIC is
initiated as an energetic\nquark\, and its substructure arises from its s
plitting into a quark-\ngluon system. The spectrum of gluons within this q
uark jet is then\nheavily modified by multiple scattering in the QCD mediu
m\,\nallowing jet substructure to be used to pin down the transport\nprope
rties of cold nuclear matter. In this talk\, I will present new\nresults o
n the gluon spectrum of a quark jet computed to an\narbitrary order in opa
city (the average number of scatterings in\nthe medium). This calculation
goes beyond the simplifying limit\nin which the gluon radiation is soft an
d can be interpreted as\nenergy loss of the quark\, and it extends previou
s work which\ncomputes the full gluon spectrum only to first order in opac
ity.\nIn addition to presenting the general structure of the all-orders\nr
esult\, I will also show specific evaluations of the gluon\nspectrum at th
e first few orders in opacity and discuss its\nsensitivity to the transpor
t properties of large nuclei.\n\nhttps://indico.cern.ch/event/656452/contr
ibutions/2869955/
LOCATION:Palazzo del Casinò Sala Mosaici-1\, 3rd Floor
URL:https://indico.cern.ch/event/656452/contributions/2869955/
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BEGIN:VEVENT
SUMMARY:Characterizing hydrodynamical fluctuations in heavy-ion collisio
ns from effective field theory approach
DTSTART;VALUE=DATE-TIME:20180516T124000Z
DTEND;VALUE=DATE-TIME:20180516T130000Z
DTSTAMP;VALUE=DATE-TIME:20200330T205322Z
UID:indico-contribution-264326-2869954@indico.cern.ch
DESCRIPTION:Speakers: Pak Hang Lau (MIT)\nHydrodynamic fluctuations are fo
und to be important in many situations such as cosmology\, condensed matte
r system and heavy-ion collisions. Recently\, an effective field theory fo
r fluctuating dissipative hydrodynamics has been developed in 1511.03646 a
nd 1701.07817. We apply this theory to investigate non-trivial consequence
hydrodynamic fluctuations on the Bjorken expanding quark gluon plasma (
QGP). In particular\, we explore nontrivial effects due to interactions am
ong hydrodynamical variables and noises which are systematically incorpora
ted in the present framework but are not fully captured in conventional ap
proaches. Finally\, we discuss its application to model bulk evolution of
QCD matter near the critical point as well as extracting shear viscosity o
f QGP.\n\nhttps://indico.cern.ch/event/656452/contributions/2869954/
LOCATION:Palazzo del Casinò Sala Mosaici-1\, 3rd Floor
URL:https://indico.cern.ch/event/656452/contributions/2869954/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A resummed method of moments for the relativistic hydrodynamic exp
ansion
DTSTART;VALUE=DATE-TIME:20180516T082000Z
DTEND;VALUE=DATE-TIME:20180516T084000Z
DTSTAMP;VALUE=DATE-TIME:20200330T205322Z
UID:indico-contribution-264326-2869960@indico.cern.ch
DESCRIPTION:Speakers: Leonardo Tinti (The Ohio State University)\nA modern
approach to obtaining the equations of motion of dissipative relativistic
hydrodynamics relies on various approximations of the relativistic Boltzm
ann equation. There is a mounting evidence that the standard Chapman-Ensko
g expansion of the Boltzmann equation has a vanishing radius of convergenc
e. The method of moments\, on the other hand\, is free from such problems.
The equations thus obtained can be systematically improved\, and their co
nvergence properties checked. However\, if one introduces mean-field inter
actions\, for example in the form of a medium-dependent mass or an externa
l gauge field interacting with the plasma\, this systematic expansion brea
ks down: Successive moments are found to couple not only to energy moments
of higher\, but also of lower order\,which diverge in the ultra-relativis
tic (massless) limit\, orrequire unrealistic machine precision. This probl
em is even worse if one starts with the Wigner quasi-probability distribut
ion\, in order to generalize the results of the expansion. In the absence
of the on-shell condition\, all of the moments are ill defined\, with the
notable exception of the conserved currents (the stress-energy tensor).\nW
e solve the issue using resummed moments which consist of a sum of all the
moments of the same tensorial rank\, but different energy weights. The re
sulting equations are always well defined. The evolution of the hydrodynam
ics moments (four-velocity\, energy density\, pressure\, pressure correcti
ons etc.) is exactly the same as the one provided by the traditional metho
d of moments\, if such an expansion is well defined. We tested numerically
the convergence properties of the resummed expansion for some known solut
ions of the microscopic theory\, and we checked that the convergence remai
ns intact in the simplest case in which the traditional expansion breaks d
own. Namely the Boltzmann-Vlasov equation for charged mass-less particles
coupled to the Maxwell equations in a (0+1)-dimensional expansion.\n\nhttp
s://indico.cern.ch/event/656452/contributions/2869960/
LOCATION:Palazzo del Casinò Sala Casinò\, 1st Floor
URL:https://indico.cern.ch/event/656452/contributions/2869960/
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SUMMARY:Analytical solutions of causal relativistic hydrodynamic equations
for Bjorken and Gubser flow
DTSTART;VALUE=DATE-TIME:20180516T074000Z
DTEND;VALUE=DATE-TIME:20180516T080000Z
DTSTAMP;VALUE=DATE-TIME:20200330T205322Z
UID:indico-contribution-264326-2869957@indico.cern.ch
DESCRIPTION:Speakers: Chandrodoy Chattopadhyay (Tata Institute of Fundamen
tal Research)\nBjorken and Gubser flow profiles are well known analytic so
lutions for relativistic Navier-Stokes equations. Recently several attempt
s have been made to obtain analytic solutions for relativistic second-orde
r dissipative hydrodynamic equations with Bjorken and Gubser flow. We obta
in general analytical solutions\, for these flow profiles\, up to third-or
der viscous hydrodynamic equations for a system with vanishing bulk viscos
ity and chemical potential\, and having a constant shear relaxation time.
We also analytically determine the hydrodynamic attractors for such system
s by studying the universal behavior of these solutions at late times wher
e all informations about the initial conditions are lost. Finally we discu
ss the properties of these hydrodynamic attractors for transport coefficie
nts obtained from relativistic kinetic theory in the relaxation-time appro
ximation.\n\nhttps://indico.cern.ch/event/656452/contributions/2869957/
LOCATION:Palazzo del Casinò Sala Casinò\, 1st Floor
URL:https://indico.cern.ch/event/656452/contributions/2869957/
END:VEVENT
BEGIN:VEVENT
SUMMARY:(3+1)D Viscous Anisotropic Hydrodynamics for Nonconformal Fluids
DTSTART;VALUE=DATE-TIME:20180516T080000Z
DTEND;VALUE=DATE-TIME:20180516T082000Z
DTSTAMP;VALUE=DATE-TIME:20200330T205322Z
UID:indico-contribution-264326-2869956@indico.cern.ch
DESCRIPTION:Speakers: Mike McNelis (The Ohio State University)\nAnisotropi
c hydrodynamics improves upon standard dissipative fluid dynamics by treat
ing certain large dissipative corrections non-perturbatively. Relativistic
heavy-ion collisions feature two such large dissipative effects: (i) Stro
ngly anisotropic expansion generates a large shear stress component which
manifests itself in very different longitudinal and transverse pressures\,
especially at early times. (ii) Critical fluctuations near the quark-hadr
on phase transition lead to a large bulk viscous pressure on the conversio
n surface between hydrodynamics and a microscopic hadronic cascade descrip
tion of the final collision stage. \n\nWe present a new dissipative hydro
dynamic formulation for non-conformal fluids where both of these effects a
re treated nonperturbatively. The evolution equations are derived from the
Boltzmann equation in the 14-moment approximation\, using an expansion ar
ound an anisotropic leading-order distribution function with two momentum-
space deformation parameters\, accounting for the longitudinal and transve
rse pressures. Generalized Landau matching conditions for the longitudinal
and transverse pressures are then required to obtain their evolution. We
describe an approximate anisotropic equation of state that relates the ani
sotropy parameters with the macroscopic pressures. Residual shear stresses
are smaller and are treated perturbatively\, as in standard second-order
dissipative fluid dynamics.\n\nThe resulting optimized viscous anisotropic
hydrodynamic evolution equations are derived in 3+1 dimensions and tested
in a (0+1)-dimensional Bjorken expansion\, using an updated lattice equat
ion of state. Comparisons with other viscous hydrodynamical frameworks are
presented.\n\nhttps://indico.cern.ch/event/656452/contributions/2869956/
LOCATION:Palazzo del Casinò Sala Casinò\, 1st Floor
URL:https://indico.cern.ch/event/656452/contributions/2869956/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anomlaous hydrodynamics from projection operator method
DTSTART;VALUE=DATE-TIME:20180516T070000Z
DTEND;VALUE=DATE-TIME:20180516T072000Z
DTSTAMP;VALUE=DATE-TIME:20200330T205322Z
UID:indico-contribution-264326-2869958@indico.cern.ch
DESCRIPTION:Speakers: Masaru Hongo (RIKEN)\nAnomalous hydrodynamics is a l
ow-energy effective theory that captures anomaly-induced transport such as
the chiral magnetic effect. Although there are several derivations of ano
malous hydrodynamic equation from microscopic quantum theory\, it has been
unclear how we can derive it based on the operator formalism of quantum t
heory. In this study\, we derive anomalous hydrodynamic equation based on
so-called Mori's projection operator method\, which provides a systematic
way to derive the equation of motion for slow variables like conserved cha
rge densities in hydrodynamics. The vital point for Mori's projection oper
ator method is that it gives a generalization of the current algebra techn
ique used in low-energy hadron dynamics of the QCD vacuum to the nonequili
brium situations. As a result\, we find that the chiral magnetic effect is
caused by the anomalous commutation relation between vector and axial cha
rge densities which represents a manifestation of the quantum anomaly in t
he operator formalism. We further discuss an extension of our derivation t
o the symmetry-broken phase which brings about anomalous superfluid hydrod
ynamics.\n\nhttps://indico.cern.ch/event/656452/contributions/2869958/
LOCATION:Palazzo del Casinò Sala Casinò\, 1st Floor
URL:https://indico.cern.ch/event/656452/contributions/2869958/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hydrodynamization and Attractors at Intermediate Coupling
DTSTART;VALUE=DATE-TIME:20180516T072000Z
DTEND;VALUE=DATE-TIME:20180516T074000Z
DTSTAMP;VALUE=DATE-TIME:20200330T205322Z
UID:indico-contribution-264326-2869959@indico.cern.ch
DESCRIPTION:Speakers: Ben Meiring (University of Oxford)\nThe tremendous s
uccess of hydrodynamics in describing the Quark-Gluon Plasma poses many ch
allenges to our understanding of collective phenomena in interacting syste
ms out of equilibrium. Recently the concept of hydrodynamic attractors\, w
hich generalize the gradient expansion beyond local thermal equilibrium\,
has been put forward. In this talk we will present the first analysis of t
his configuration at intermediate coupling. Using holography\, we resum la
rge orders in the gradient expansion to constrain the hydrodynamization dy
namics and the attractor beyond the strong coupling limit. We find that in
dependent of the coupling\, hydrodynamization occurs at early times where
the pressure anisotropies are large\, and that the attractor is determined
by first order hydrodynamics. By comparing our results to kinetic theory\
, we also observe that the approach of different configurations to the att
ractor is faster in gravity/based computations than in an extrapolation of
kinetic theory to intermediate coupling.\n\nhttps://indico.cern.ch/event/
656452/contributions/2869959/
LOCATION:Palazzo del Casinò Sala Casinò\, 1st Floor
URL:https://indico.cern.ch/event/656452/contributions/2869959/
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