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SUMMARY:Renormalisation of non-perturbative calculations in scalar theorie
s
DTSTART;VALUE=DATE-TIME:20180626T170000Z
DTEND;VALUE=DATE-TIME:20180626T173000Z
DTSTAMP;VALUE=DATE-TIME:20230925T004718Z
UID:indico-contribution-66-182@indico.ice.csic.es
DESCRIPTION:Speakers: Margaret Carrington (Brandon University)\nNon-pertur
bative techniques are needed to study strongly coupled systems. One powerf
ul approach is the n-particle irreducible effective action. The technique
provides a systematic expansion for which the truncation occurs at the lev
el of the action. However\, renormalisation using a standard counterterm a
pproach is not well understood. At the 2PI level one must introduce multip
le counterterms\, and at higher orders there is no known way to renormalis
e an nPI theory using counterterms. On the other hand\, renormalisation is
much simpler using a renormalisation group approach. We present results f
rom a calculation using a scalar theory with quartic coupling in 4 dimensi
ons\, at the 4 loop level. The 2PI theory is renormalised using one bare c
oupling constant which is introduced at the level of the Lagrangian. We sh
ow that the method can be generalised to higher order calculations.\n\nhtt
ps://indico.ice.csic.es/event/6/contributions/182/
LOCATION:Barcelona Gamma
URL:https://indico.ice.csic.es/event/6/contributions/182/
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BEGIN:VEVENT
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:20230925T004718Z
UID:indico-contribution-66-176@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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BEGIN:VEVENT
SUMMARY:Excitation and saturation of the spinodal instability
DTSTART;VALUE=DATE-TIME:20180626T180000Z
DTEND;VALUE=DATE-TIME:20180626T183000Z
DTSTAMP;VALUE=DATE-TIME:20230925T004718Z
UID:indico-contribution-66-145@indico.ice.csic.es
DESCRIPTION:Speakers: maximilian attems (Universidad de Santiago de Compos
tela)\nEver since the discovery of the quark-Gluon plasma (QGP) the locati
on of the critical point in the QCD phase diagram - the end point of the f
irst-order transition between hadron matter and QGP - has been a main rese
arch goal for heavy-ion collisions experiments. We use the gauge/gravity d
uality to study as first a four-dimensional\, strongly-coupled gauge theor
y with a first-order thermal phase transition. In the dual gauge theory th
e Gregory-Laflamme instability corresponds to the spinodal instability. We
uncover the favored final phase separated state across phase mergers. Thi
s final inhomogeneous system is independent of the early unstable mode exc
itations.\n\nhttps://indico.ice.csic.es/event/6/contributions/145/
LOCATION:Barcelona Gamma
URL:https://indico.ice.csic.es/event/6/contributions/145/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fluctuatioans and long time tails in fluid dynamics
DTSTART;VALUE=DATE-TIME:20180626T153000Z
DTEND;VALUE=DATE-TIME:20180626T160000Z
DTSTAMP;VALUE=DATE-TIME:20230925T004718Z
UID:indico-contribution-66-130@indico.ice.csic.es
DESCRIPTION:Speakers: Thomas Schaefer (North Carolina State University)\nW
e revisit the calculation of long time tails in non-relativistic fluid dyn
amics. We show how to compute long time tails and bounds on transport coef
ficients in the shear\, bulk\, and thermal diffusivity channel. We study t
he constraints from scale invariance\, and we show how the calculations ca
n be extended to account for critical behavior.\n\nhttps://indico.ice.csic
.es/event/6/contributions/130/
LOCATION:Barcelona Gamma
URL:https://indico.ice.csic.es/event/6/contributions/130/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semiholography for heavy ion collisions: recent developments
DTSTART;VALUE=DATE-TIME:20180626T173000Z
DTEND;VALUE=DATE-TIME:20180626T180000Z
DTSTAMP;VALUE=DATE-TIME:20230925T004718Z
UID:indico-contribution-66-125@indico.ice.csic.es
DESCRIPTION:Speakers: Florian Preis (Technische Universität Wien)\nWe dis
cuss recent developments in the semiholographic model for heavy ion collis
ions (HICs) proposed by Iancu and Mukhopadhyay and further developed by Mu
khopadhyay\, FP\, Rebhan\, and Stricker. In this approach a GLASMA descrip
tion of the early stages of HICs\, i.e. a classical Yang-Mills field theor
y is coupled to a holographic model which plays the role of a bath of stro
ngly coupled gluons. We will show the first results of such a setup in the
fully dynamical non-equilibrium regime in particular how the classical Ya
ng-Mills sector looses energy to the strongly coupled sector. Finally we d
iscuss in more generality\, how to consistently couple holographic descrip
tions of non-perturbative physics to classical and perturbative quantum fi
eld theories.\n\nhttps://indico.ice.csic.es/event/6/contributions/125/
LOCATION:Barcelona Gamma
URL:https://indico.ice.csic.es/event/6/contributions/125/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Relativistic magneto-hydrodynamics
DTSTART;VALUE=DATE-TIME:20180626T160000Z
DTEND;VALUE=DATE-TIME:20180626T163000Z
DTSTAMP;VALUE=DATE-TIME:20230925T004718Z
UID:indico-contribution-66-121@indico.ice.csic.es
DESCRIPTION:Speakers: Pavel Kovtun (University of Victoria)\nI will talk a
bout relativistic thermodynamics and magneto-hydrodynamics\, with an empha
sis on the derivative expansion\, the transport coefficients\, and the Kub
o formulas.\n\nhttps://indico.ice.csic.es/event/6/contributions/121/
LOCATION:Barcelona Gamma
URL:https://indico.ice.csic.es/event/6/contributions/121/
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