Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 42: Schwerionenkollisionen und QCD Phasen

HK 42.5: Talk

Thursday, March 20, 2014, 15:15–15:30, HZ 7

Spectral Functions for the Quark-Meson Model Phase Diagram from the Functional Renormalization Group — •Ralf-Arno Tripolt¹, Nils Strodthoff², Lorenz von Smekal^1,3, and Jochen Wambach^1,4 — ¹Theoriezentrum, Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany — ²Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany — ³Institut für Theoretische Physik, Justus-Liebig-Universität Giessen, 35392 Giessen, Germany — ⁴GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany

We present a method to obtain spectral functions at finite temperature and density from the Functional Renormalization Group. Our method is based on a thermodynamically consistent truncation of the flow equations for 2-point functions with analytically continued frequency components in the originally Euclidean external momenta. For the uniqueness of this continuation at finite temperature we furthermore implement the physical Baym-Mermin boundary conditions. We demonstrate the feasibility of the method by calculating the mesonic spectral functions in the quark-meson model along the temperature axis of the phase diagram, and at finite quark chemical potential along the fixed-temperature line that crosses the critical endpoint of the model.