Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 12: Quantum gases: Bosons, mixtures and spinor gases

Q 12.7: Talk

Monday, March 17, 2014, 15:30–15:45, UDL HS2002

A new renormalization-group approach to superfluid turbulence and non-thermal fixed points — Thomas Gasenzer, •Steven Mathey, and Jan M. Pawlowski — Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany

We investigate stationary scaling solutions of the driven dissipative Gross Pitaevskii equation by means of the functional renormalisation group. The hydrodynamic decomposition of the wave function is exploited to describe the system in terms of the stochastic Burgers equation.

The renormalization group flow equations are closed with a very general, non perturbative, momentum dependent truncation. We write and solve RG fixed point equations for our ansatz which gives access to all the non trivial scaling solution it can support. Our results compare well to the outcome of 1d perturbative calculations. We find another yet unobserved non perturbative fixed point with original scaling exponents.