Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 28: Theorie

HK 28.3: Talk

Tuesday, March 11, 2008, 11:45–12:00, 2F

The QCD phase diagram from effective models — •Bernd-Jochen Schaefer¹ and Jochen Wambach^2,3 — ¹Institut für Physik, KFU Graz, Austria — ²Institut für Kernphysik, TU Darmstadt, Germany — ³GSI, Darmstadt, Germany

Chiral symmetry breaking and confinement are two important non-perturbative feature of low-energy QCD. At finite temperature and density QCD predicts a phase transition and a new deconfined phase of matter emerges.

In this talk the phase structure of different effective quark-meson models are presented. In pure Yang-Mills theory the expectation value of the Polyakov loop serves as an order parameter for confinement. The impact of the Polyakov loop dynamics on the phase diagram is also addressed.

All used models exhibit a critical endpoint in the phase diagram where fluctuations become important. The influence of fluctuations around criticality is demonstrated by an comparison of the mean-field approximation with a renormalization group analysis.