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Title: Initial conditions for hydrodynamics from kinetic theory equilibration

Abstract

Here we use effective kinetic theory to study the pre-equilibrium dynamics in heavy-ion collisions. We describe the evolution of linearized energy perturbations on top of out-of-equilibrium background to the energy-momentum tensor at a time when hydrodynamics becomes applicable. We apply this description to IP-Glasma initial conditions and find an overall smooth transition to hydrodynamics. In a phenomenologically favorable range of η/s values, early time dynamics can be accurately described in terms of a few functions of a scaled time variable τT/(η/s). Our framework can be readily applied to other initial state models to provide the pre-equilibrium dynamics of the energy momentum tensor.

Authors:
 [1];  [2];  [3];  [4];  [3]
  1. European Organization for Nuclear Research (CERN), Geneva (Switzerland); Univ. of Stavanger, Stavanger (Norway)
  2. Stony Brook Univ., Stony Brook, NY (United States); Univ. Heidelberg, Heidelberg (Germany)
  3. Stony Brook Univ., Stony Brook, NY (United States)
  4. Univ. of Washington, Seattle, WA (United States)
Publication Date:
Research Org.:
The State Univ. of New York, Stony Brook, NY (United States); Univ. of Washington, Seattle, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1502376
Grant/Contract Number:  
[FG02-88ER40388; FG02-97ER41014]
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Physics. A
Additional Journal Information:
[ Journal Volume: 967; Journal Issue: C]; Journal ID: ISSN 0375-9474
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Quark Gluon Plasma; heavy ion collisions; bottom-up thermalization; effective kinetic theory

Citation Formats

Kurkela, Aleksi, Mazeliauskas, Aleksas, Paquet, Jean -François, Schlichting, Sören, and Teaney, Derek. Initial conditions for hydrodynamics from kinetic theory equilibration. United States: N. p., 2017. Web. doi:10.1016/j.nuclphysa.2017.04.009.
Kurkela, Aleksi, Mazeliauskas, Aleksas, Paquet, Jean -François, Schlichting, Sören, & Teaney, Derek. Initial conditions for hydrodynamics from kinetic theory equilibration. United States. doi:10.1016/j.nuclphysa.2017.04.009.
Kurkela, Aleksi, Mazeliauskas, Aleksas, Paquet, Jean -François, Schlichting, Sören, and Teaney, Derek. Mon . "Initial conditions for hydrodynamics from kinetic theory equilibration". United States. doi:10.1016/j.nuclphysa.2017.04.009. https://www.osti.gov/servlets/purl/1502376.
@article{osti_1502376,
title = {Initial conditions for hydrodynamics from kinetic theory equilibration},
author = {Kurkela, Aleksi and Mazeliauskas, Aleksas and Paquet, Jean -François and Schlichting, Sören and Teaney, Derek},
abstractNote = {Here we use effective kinetic theory to study the pre-equilibrium dynamics in heavy-ion collisions. We describe the evolution of linearized energy perturbations on top of out-of-equilibrium background to the energy-momentum tensor at a time when hydrodynamics becomes applicable. We apply this description to IP-Glasma initial conditions and find an overall smooth transition to hydrodynamics. In a phenomenologically favorable range of η/s values, early time dynamics can be accurately described in terms of a few functions of a scaled time variable τT/(η/s). Our framework can be readily applied to other initial state models to provide the pre-equilibrium dynamics of the energy momentum tensor.},
doi = {10.1016/j.nuclphysa.2017.04.009},
journal = {Nuclear Physics. A},
number = [C],
volume = [967],
place = {United States},
year = {2017},
month = {9}
}

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Figures / Tables:

Fig. 1. Fig. 1. : (a) Energy density decomposition to the average and perturbations within a causal circle |x−x0 | < $c$($τ$init−$τ$0), which determines the system response at ($τ$init, $x$0). (b) Kinetic theory equilibration of boost invariant background energy density in scaled time units $τ$T/(4$πη$/$s$), where T($τ$) ≡ 1/$τ$1/3 lim$τ$→∞($τ$1/3$T$($τ$)). At earlymore » times the expansion resembles free streaming, but at late times the evolution agrees with the hydrodynamic gradient expansion given in Eq. (3)« less

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