Bonn 2020 – scientific programme
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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik
MP 5: QFT Far From Equilibrium
MP 5.2: Talk
Tuesday, March 31, 2020, 12:05–12:25, H-HS VII
Effective Transport Coefficients in Time-Dependent Field Theory: Far-from-Equilibrium Shear Viscosity via Holography — •Michael Florian Wondrak1,2, Matthias Kaminski3, and Marcus Bleicher1,2 — 1Frankfurt Institute for Advanced Studies (FIAS), Frankfurt am Main, Germany — 2Institut für Theoretische Physik, Goethe-Universität Frankfurt am Main, Germany — 3Department of Physics and Astronomy, University of Alabama, Tuscaloosa, USA
The gauge/gravity duality offers an elegant way of characterizing field theories at strong coupling. Close to equilibrium, hydrodynamic transport coefficients have been calculated successfully. Far from equilibrium, mainly thermodynamic properties have been focused on.
In this talk, we extend the definition of the transport coefficients from the quasi-static to the highly dynamic regime. Our approach is based on Wigner transformations within the Green–Kubo formalism. Furthermore, we contrast field-theory and bulk-spacetime generalizations of the entropy density.
We consider a conformal field theory at time-dependent temperature and chemical potential corresponding to an accreting black hole in the bulk. Asymptotically, we consistently recover the well-known quasi-static value of the shear viscosity to entropy density ratio. During the dynamic regime, we find substantial deviations of order one.