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SUMMARY:How does relativistic kinetic theory remember about initial condit
ions?
DTSTART;VALUE=DATE-TIME:20180626T150000Z
DTEND;VALUE=DATE-TIME:20180626T153000Z
DTSTAMP;VALUE=DATE-TIME:20230925T003345Z
UID:indico-contribution-176@indico.ice.csic.es
DESCRIPTION:Speakers: Michal Heller (MPI for Gravitational Physics (Albert
Einstein Institute) / National Centre for Nuclear Research)\nUnderstandin
g hydrodynamization in microscopic models of heavy-ion collisions has been
an important topic in current research. Many lessons obtained within the
strongly-coupled (holographic) models originate from the properties of tra
nsient excitations of equilibrium encapsulated by short-lived quasinormal
modes of black holes. The aim of this talk is to develop similar intuition
for expanding plasma systems described by\, perhaps\, the simplest model
from the weakly-coupled domain\, i.e. the Boltzmann equation in the relaxa
tion time approximation. I will show that in this kinetic theory setup the
re are infinitely many transient modes carrying at late times the vast maj
ority of information about the initial distribution function. They all hav
e the same exponential damping set by the relaxation time but are distingu
ished by different power-law suppressions and different frequencies of ver
y slow\, logarithmic in proper time\, oscillations. Finally\, I will analy
ze the resurgent interplay between the hydrodynamics and transients. In pa
rticular\, I will show that there are choices of relaxation time dependenc
e on temperature for which the asymptotics of the divergent hydrodynamic s
eries is dominated not be the least damped transient\, but rather by an un
physical exponential correction having to do with non-analyticities of the
equation of motion in complexified time variable.\n\nhttps://indico.ice.c
sic.es/event/6/contributions/176/
LOCATION:Barcelona Gamma
URL:https://indico.ice.csic.es/event/6/contributions/176/
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