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HK: Fachverband Physik der Hadronen und Kerne
HK 26: Schwerionenkollisionen und QCD Phasen
HK 26.1: Group Report
Tuesday, March 18, 2014, 16:45–17:15, HZ 6
Shear viscosity from a large-Nc NJL model — •Robert Lang1,3, Tetsuo Hatsuda3, Norbert Kaiser1, and Wolfram Weise2,1 — 1TUM Physik Department, Garching, Germany — 2ECT* Villa Tambosi, Villazzano (TN), Italy — 3RIKEN Nishina Center, Wakoshi, Japan
We investigate the shear viscosity to entropy ratio within the vicinity of the chiral phase transition/crossover using the NJL model in a large-Nc expansion. As heavy-ion collisions at RHIC and LHC in combination with hydrodynamic simulations suggest, this ratio is close to the AdS/CFT benchmark. This indicates a strongly correlated state of matter produced in such collisions. We study in detail the non-perturbative structure of the NJL model and the question if resummation techniques are required. In the large-Nc expansion next-to-leading-order contributions to the shear viscosity are derived.