Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 26: Theorie
HK 26.1: Gruppenbericht
Dienstag, 8. März 2005, 14:00–14:30, TU MA004
The Phase Diagram of the Quark-Meson Model — •Bernd-Jochen Schaefer1 and Jochen Wambach1,2 — 1Institut für Kernphysik, TU Darmstadt — 2GSI, Darmstadt
A renormalization group (RG) analysis of the chiral phase diagram of a two-flavor quark-meson model is presented. Using the proper-time RG approach in the chiral limit two transition lines in the phase diagram at finite chemical potential and small temperatures are observed. The sensitivity and cutoff dependence of this novel result on the approximation used are discussed and compared with an so-called Exact RG approach. The influence of a finite (realistic) pion mass on the phase diagram is discussed.