Phases of QCD: lattice thermodynamics and a field theoretical model

Details Phases of QCD: lattice thermodynamics and a field theoretical model Phases of QCD: lattice thermodynamics and a field theoretical model

2005-06-23

arxiv.org/abs/hep-ph/0506234v2

Phys.Rev.D73:014019,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 10 figures, version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.73.014019

We investigate three-colour QCD thermodynamics at finite quark chemical potential. Lattice QCD results are compared with a generalized Nambu Jona-Lasinio model in which quarks couple simultaneously to the chiral condensate and to a background temporal gauge field representing Polyakov loop dynamics. This so-called PNJL model thus includes features of both deconfinement and chiral symmetry restoration. The parameters of the Polyakov loop effective potential are fixed in the pure gauge sector. The chiral condensate and the Polyakov loop as functions of temperature and quark chemical potential are calculated by minimizing the thermodynamic potential of the system. The resulting equation of state, (scaled) pressure difference and quark number density at finite quark chemical potential are then confronted with corresponding Lattice QCD data.

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