Thermodynamic quark susceptibilties in the PNJL model

M. Cristoforetti, T. Hell, B. Klein, W. Weise

Research output: Contribution to journalConference articlepeer-review


Applying Monte-Carlo methods to the Polyakov-loop extended Nambu-Jona-Lasinio (PNJL) model we go beyond the saddle-point approximation in a mean-field calculation and introduce fluctuations around the mean fields. The impact of fluctuations on the thermodynamics of the model in the two-flavor case becomes evident by studying the second-order Taylor expansion coefficients of the thermodynamic grand-canonical partition function with respect to the quark chemical potential. Here we show a comparison with extrapolations from lattice QCD. We find that in order to reproduce lattice data for the flavor non-diagonal quark susceptibilities the introduction of fluctuations is unavoidable.

Original languageEnglish
JournalProceedings of Science
StatePublished - 2010
Event28th International Symposium on Lattice Field Theory, Lattice 2010 - Villasimius, Sardinia, Italy
Duration: 14 Jun 201019 Jun 2010


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