Shear transport far from equilibrium via holography

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Date

2020

Journal Title

Journal ISSN

Volume Title

Publisher

Elsevier

Abstract

In heavy-ion collisions, the quark-gluon plasma is produced far from equilibrium. This regime is currently inaccessible by direct quantum chromodynamics (QCD) computations. In a holographic context, we propose a general method to characterize transport properties based on well-defined two-point functions. We calculate shear transport and entropy far from equilibrium, defining a time-dependent ratio of shear viscosity to entropy density, (\eta /s). Large deviations from its near-equilibrium value (1/4\pi ), up to a factor of 2.5, are found for realistic situations at the Large Hadron Collider. We predict the far-from-equilibrium time-dependence of (\eta /s) to substantially affect the evolution of the QCD plasma and to impact the extraction of QCD properties from flow coefficients in heavy-ion collision data.

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Keywords

eta/s, Far from equilibrium, Heavy-ion collisions, Holography, Shear viscosity, QUARK-GLUON PLASMA, VISCOSITY, HYDRODYNAMICS, Astronomy & Astrophysics, Physics, Nuclear, Physics, Particles & Fields, Physics

Citation

Wondrak, M. F., Kaminski, M., & Bleicher, M. (2020). Shear transport far from equilibrium via holography. In Physics Letters B (Vol. 811, p. 135973). Elsevier BV. https://doi.org/10.1016/j.physletb.2020.135973