Browsing by Author "Wondrak, Michael F."

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    AdS/CFT far from equilibrium in a Vaidya setup
    (2017) Wondrak, Michael F.; Kaminski, Matthias; Nicolini, Piero; Bleicher, Marcus; University of Alabama Tuscaloosa
    In this paper we apply the AdS/CFT correspondence to study a strongly coupled plasma far from equilibrium with a strong emphasis on the shear behavior. The plasma serves as a model for an electrically charged quark-gluon plasma. On the gravitational side, we use an ingoing Vaidya black brane spacetime. The highest rate of mass infall is confined to a short time interval.
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    Shear transport far from equilibrium via holography
    (Elsevier, 2020) Wondrak, Michael F.; Kaminski, Matthias; Bleicher, Marcus; Goethe University Frankfurt; University of Alabama Tuscaloosa; Helmholtz Association; GSI Helmholtz-Center for Heavy Ion Research
    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.