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Title: Turbulent thermalization process in high-energy heavy-ion collisions

Authors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1201331
Report Number(s):
BNL-107775-2015-JA
Journal ID: ISSN 0375-9474; KB0301020
DOE Contract Number:
DE-SC00112704
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Physics. A; Journal Volume: 931
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Turbulent thermalization

Citation Formats

Berges J., Schenke B., Schlichting, S, and Venugopalan, R. Turbulent thermalization process in high-energy heavy-ion collisions. United States: N. p., 2014. Web. doi:10.1016/j.nuclphysa.2014.08.103.
Berges J., Schenke B., Schlichting, S, & Venugopalan, R. Turbulent thermalization process in high-energy heavy-ion collisions. United States. doi:10.1016/j.nuclphysa.2014.08.103.
Berges J., Schenke B., Schlichting, S, and Venugopalan, R. Tue . "Turbulent thermalization process in high-energy heavy-ion collisions". United States. doi:10.1016/j.nuclphysa.2014.08.103.
@article{osti_1201331,
title = {Turbulent thermalization process in high-energy heavy-ion collisions},
author = {Berges J. and Schenke B. and Schlichting, S and Venugopalan, R.},
abstractNote = {},
doi = {10.1016/j.nuclphysa.2014.08.103},
journal = {Nuclear Physics. A},
number = ,
volume = 931,
place = {United States},
year = {Tue Sep 02 00:00:00 EDT 2014},
month = {Tue Sep 02 00:00:00 EDT 2014}
}
  • We study entropy production in the early stage of high-energy heavy-ion collisions due to shear viscosity. We employ the second-order theory of Israel-Stewart with two different stress relaxation times, as appropriate for strong coupling or for a Boltzmann gas, respectively, and compare the hydrodynamic evolution. Based on the present knowledge of initial particle production, we argue that entropy production is tightly constrained. We derive new limits on the shear viscosity to entropy density ratio {eta}/s, independent from elliptic flow effects, and determine the corresponding Reynolds number. Furthermore, we show that for a given entropy production bound, the initial time {tau}{submore » 0} for hydrodynamics is correlated to the viscosity. The conjectured lower bound for {eta}/s provides a lower limit for {tau}{sub 0}.« less
  • We discuss the quantum mechanical decay of the color magnetic field generated initially during high-energy heavy-ion collisions. The decay is caused by Nielsen-Olesen unstable modes and is accomplished possibly in a period <1 fm/c. We show that the decay products (i.e., incoherent gluons) may be thermalized in a sufficiently short period (<1 fm/c). The precise determination of the period is made by calculating the two-point function of the color magnetic field in a color glass condensate model.
  • Transverse momentum correlations in the azimuthal angle of hadrons produced owing to minijets are first studied within the HIJING Monte Carlo model in high-energy heavy-ion collisions. Quenching of minijets during thermalization is shown to lead to significant diffusion (broadening) of the correlation. Evolution of the transverse momentum density fluctuation that gives rise to this correlation in azimuthal angle in the later stage of heavy-ion collisions is further investigated within a linearized diffusion-like equation and is shown to be determined by the shear viscosity of the evolving dense matter. This diffusion equation for the transverse momentum fluctuation is solved with initialmore » values given by HIJING and together with the hydrodynamic equation for the bulk medium. The final transverse momentum correlation in azimuthal angle is calculated along the freeze-out hypersurface and is found to be further diffused for higher values of the shear viscosity to entropy density ratio, {eta}/s{approx}0.2-0.4. Therefore the final transverse momentum correlation in azimuthal angle can be used to study the thermalization of minijets in the early stage of heavy-ion collisions and the viscous effect in the hydrodynamic evolution of strongly coupled quark-gluon plasma.« less
  • The dynamics of partons in ultrarelativistic [sup 197]Au+[sup 197]Au collisions in the future collider experiments at the BNL Relativistic Heavy Ion Collider and the CERN Large Hadron Collider during the first 3 fm/[ital c] is simulated in full six-dimensional phase space within a parton cascade model to compute the entropy production and the space-time-dependent energy densities, temperatures, etc., in the central collision region. The partons' evolution from preequilibrium towards the formation of a thermalized quark-gluon plasma is investigated and compared to the Bjorken scenario. Moreover, an equation of state is extracted together with initial conditions for the further hydrodynamical space-timemore » evolution of the matter. For central [sup 197]Au+[sup 197]Au collisions with [radical][ital s] =200--6300[ital A] GeV the predictions for the energy densities and associated temperatures at [ital t]=3 fm/[ital c] after the first instant of the collisions are [var epsilon]=15--31 GeV/fm[sup 3] and [ital T]=297--343 MeV, respectively. The multiplicity of final pions from the plasma is estimated from the amount of entropy produced, yielding a huge [ital dN][sup ([pi])]/[ital dy][congruent]1900--3400.« less