Shear transport far from equilibrium via holography
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, η/s. Large deviations of up to 60% from its near-equilibrium value, 1/4π, are found for realistic situations at the Large Hadron Collider. We predict the far-from-equilibrium time-dependence of η/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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