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HK: Fachverband Hadronen und Kerne

HK 68: Heavy Ion Collisions and QCD phases

HK 68.8: Talk

Thursday, March 19, 2009, 18:30–18:45, H-ZO 10

QCD thermodynamics and Monte-Carlo simulations with the PNJL model — •Marco Cristoforetti, Thomas Hell, Bertram Klein, and Wolfram Weise — Technische Universität München, James-Franck-Str. 1, D85747 Garching

Results of QCD thermodynamics from lattice computations can be reproduced surprisingly well within the Polyakov Nambu Jona-Lasinio model at the mean field level. The quasiparticle PNJL model combines the spontaneous breaking of chiral symmetry with the dymanics of the Polyakov loop as an order parameter for the confinement-deconfinement transition.

A deeper understanding of these results requires the investigation of quantum fluctuations in the PNJL model. This can be done by numerical simulations of the thermodynamic partition function using standard Monte-Carlo techniques. We present how, in the PNJL approach, the inclusion of fluctuations of the bosonic fields permits one to reproduce accurately lattice results (such as mixed quark susceptibilities) that vanish in the mean field approximation.

Work supported in part by BMBF, GSI, the DFG Excellence Cluster Origin and Structure of the Universe