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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Schwerionenkollisionen und QCD Phasen

HK 21.1: Gruppenbericht

Dienstag, 20. März 2012, 16:30–17:00, P 5

Quark-meson-diquark model for two-color QCD — •Nils Strodthoff¹, Bernd-Jochen Schaefer^2,3, and Lorenz von Smekal¹ — ¹Institut für Kernphysik, TU Darmstadt, Germany — ²Institut für Physik, Karl-Franzens-Universität Graz, Austria — ³Institut für Theoretische Physik, Universität Gießen, Germany

We introduce a two-flavor quark-meson-diquark model for two-color QCD and its extensions to include gauge-field dynamics as described by the Polakov loop. Grand potential and phase structure are being studied both in mean-field approximation and with the functional renormalization group. The model provides an explicit example for the importance of baryonic degrees of freedom: When they are omitted, the phase diagram closely resembles that of the corresponding (Polyakov)-quark-meson models for QCD, in particular including their critical endpoint. In order to reproduce the well established main features based on the symmetries and breaking patterns of two-color QCD, however, they must be included and there is no critical endpoint.