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Darmstadt 2008 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 28: Theorie

HK 28.3: Vortrag

Dienstag, 11. März 2008, 11:45–12:00, 2F

The QCD phase diagram from effective models — •Bernd-Jochen Schaefer1 and Jochen Wambach2,31Institut 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.

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