Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 26: Theorie
HK 26.2: Gruppenbericht
Dienstag, 8. März 2005, 14:30–15:00, TU MA004
Phenomenology of Hot QCD at Finite Quark Chemical Potential — •Michael Thaler, Claudia Ratti, and Wolfram Weise — Physik Department, Technische Universität München, 85747 Garching, GERMANY
We investigate two- and three-color QCD thermodynamics at finite quark chemical potential by means of an extended Nambu-Jona-Lasinio model including the scalar diquark channel. A background temporal gauge field couples the chiral and diquark condensates to the Polyakov loop. The model includes the features of deconfinement and chiral symmetry restoration. The parameters of the Polyakov loop potential are fixed in the pure gauge sector by comparison with lattice results. The chiral and diquark condensates and the Polyakov loop expectation value as functions of temperature and quark chemical potential are obtained by minimizing the thermodynamic potential. As an application, the phase diagram, the pion and the scalar diquark masses, the scaled pressure difference Δ p(T,µ)/T4=(p(T,µ)−p(T,0))/T4 and the scaled quark number density nq(T,µ)/T3 are calculated for two and three colors. Comparison to recent lattice results is discussed.
Work supported in part by INFN and BMBF.