In holographic N=4 SYM isotropization, the late-time effective shear viscosity-to-entropy ratio depends on the quench and initial data and can fall parametrically below the KSS bound.
Shear transport far from equilibrium via holography
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abstract
In heavy-ion collisions, the quark-gluon plasma is produced far from equilibrium. This regime is currently inaccessible by quantum chromodynamics (QCD) computations. We calculate shear transport and entropy far from equilibrium in a holographic model, defining a time-dependent ratio of shear viscosity to entropy density, $\eta/s$. Large deviations of up to 60% from its near-equilibrium value, $1/4\pi$, 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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2024 1verdicts
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Shear transport in far-from-equilibrium isotropization of supersymmetric Yang-Mills plasma
In holographic N=4 SYM isotropization, the late-time effective shear viscosity-to-entropy ratio depends on the quench and initial data and can fall parametrically below the KSS bound.