Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 60: Schwerionenkollisionen und QCD Phasen

HK 60.6: Talk

Friday, March 23, 2012, 12:15–12:30, P 5

Shear Viscosity of Pion Gases — •Robert Lang, Norbert Kaiser, and Wolfram Weise — Physik Department, Technische Universität München, D-85747 Garching, Germany

Experiments at RHIC suggest that the quark-gluon plasma created in heavy-ion collisions is an almost-perfect fluid. Furthermore, the η/s ratio (shear viscosity per entropy density) turns out to be minimal at the phase transition. We discuss the formalism which connects quantum field theory at finite temperature and the macroscopic transport coefficients for dissipative hydrodynamical systems. Within the framework of ChPT we compute the shear viscosity of an interacting pion gas in the confined phase. The results are compared to the AdS/CFT bound of 1/4π.

Work supported by BMBF, GSI and the Excellence Cluster “Origin and Structure of the Universe”.