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TT: Fachverband Tiefe Temperaturen

TT 37: Matter At Low Temperature: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ... 2

TT 37.9: Talk

Thursday, March 29, 2012, 11:45–12:00, H 3005

New approach to many-body non equilibrium dynamics: functional renormalization group master equation — •Johannes Hick¹, Thomas Kloss², and Peter Kopietz¹ — ¹Institut für Theoretische Physik, Goethe Universität Frankfurt am Main, Germany — ²Laboratoire de Physique et Modélisation des Milieux Condensé, CNRS and Université Joseph Fourier, Grenoble, France

We use a functional renormalization group (FRG) approach to study the non-equilibrium time evolution of non-interacting bosons which are coupled to a phonon bath. We show that with a suitable cutoff procedure the resulting FRG flow equation for the distribution function resembles a master equation whose scale-dependent transition rates are determined by a system of FRG flow equations. We compare numerical results of this FRG master equation approach with perturbative results based on a conventional Boltzmann equation.