Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 1: Quantengase: Bosonen 1

Q 1.2: Talk

Monday, March 12, 2012, 10:45–11:00, V53.01

Shear Viscosity in Ultracold Bose Gases in 1/N-Expansion — •Roman Hennig, Thomas Gasenzer, and Jan M. Pawlowski — Institute for theoretical Physics, Heidelberg University

We investigate shear viscosity in ultracold bosonic gases, using field theoretical methods. This can be done by means of a Kubo-relation, which relates the hydrodynamic behaviour of a fluid in linear response to correlation functions of field operators. For shear viscosity we have to calculate the correlation function of the stress tensor, which involves 4-point correlation functions. To this end we apply the 1/N expansion, which is a non-perturbative resummation technique classifying diagrams according to their power in the inverse number of field components (1/N).