Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 54: Heavy Ion Collisions and QCD Phases 7

HK 54.1: Group Report

Thursday, March 26, 2015, 14:30–15:00, T/SR14

Transport coefficients and spectral functions from the functional renormalization group — •Ralf-Arno Tripolt¹, Lorenz von Smekal^{1, 2}, Jochen Wambach^{1, 3}, Christopher Jung¹, and Alexander Stegemann¹ — ¹TU Darmstadt — ²Justus-Liebig-Universität Gießen — ³GSI Helmholtzzentrum für Schwerionenforschung

We present a method to obtain spectral functions and transport coefficients like the shear viscosity from the functional renormalization group approach. Our nonperturbative method is thermodynamically consistent, symmetry preserving and based on an analytic continuation from imaginary to real time on the level of the flow equations for two-point functions. We present results for mesonic spectral functions at finite temperature, density and external momentum, in particular near the critical endpoint in the phase diagram of the quark-meson model. Moreover, first results on the shear viscosity over entropy ratio are shown.

[1] Ralf-Arno Tripolt, Lorenz von Smekal, and Jochen Wambach, Phys. Rev. D 90, 074031 (2014).

[2] Ralf-Arno Tripolt, Nils Strodthoff, Lorenz von Smekal, and Jochen Wambach, Phys. Rev. D 89, 034010 (2014).