Early-Stage Shear Viscosity far from Equilibrium via Holography

Wondrak, Michael F.; Kaminski, Matthias; Bleicher, Marcus

doi:10.1016/j.nuclphysa.2020.121880

Title: Early-Stage Shear Viscosity far from Equilibrium via Holography

Journal Article · Thu Dec 10 00:00:00 EST 2020 · Nuclear Physics. A

DOI:https://doi.org/10.1016/j.nuclphysa.2020.121880· OSTI ID:1851629

Wondrak, Michael F. ^[1];

^[2]; Bleicher, Marcus ^[1]

Johann Wolfgang Goethe-Universität, Frankfurt (Germany)
University of Alabama, Tuscaloosa, AL (United States)

We report shear viscosity is a crucial property of QCD matter which determines the collective behavior of the the quark-gluon plasma (QGP) in ultrarelativistic heavy-ion collisions. Extending the near-equilibrium, high-precision investigations in theory and experiment, we take into account the fact that, in a collision, the QGP is generated far from equilibrium. We use the AdS/CFT correspondence to study a strongly coupled plasma and find a significant impact on the ratio of shear viscosity to entropy density, η/s. In particular, we investigate the initial heating phase and find a decrease reaching down to below 60% followed by an overshoot to 110% of the near-equilibrium value. This finding might be highly relevant for the extraction of transport coefficients from anisotropic flow measurements at RHIC and LHC.

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Research Organization:: Univ. of Alabama, Tuscaloosa, AL (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Helmholtz International Center for FAIR; Helmholtz Graduate School for Hadron and Ion Research; Stiftung Polytechnische Gesellschaft Frankfurt am Main; Studienstiftung des deutschen Volkes

Grant/Contract Number:: SC0012447

OSTI ID:: 1851629

Alternate ID(s):: OSTI ID: 1760937

Journal Information:: Nuclear Physics. A, Vol. 1005, Issue C; Conference: 28. International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Wuhan (China), 4-9 Nov 2019; ISSN 0375-9474

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
η/s
holography
far from equilibrium
quark-gluon plasma
shear viscosity
time-dependent transport

Title: Early-Stage Shear Viscosity far from Equilibrium via Holography

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References (9)

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