Critical structure of the QCD medium

Details Critical structure of the QCD medium Critical structure of the QCD medium

2007-09-26

arxiv.org/abs/0709.4216v1

PoSCPOD07:032,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 3 figures; to appear in the proceedings of 4th International Workshop on 'Critical Point and Onset of Deconfinement'

Scientific paper

Fluctuations in the vicinity of a phase transition are important but neglected in mean-field theory. In order to assess the influence of such fluctuations on the critical endpoint and the size of the critical region in the QCD phase diagram, a mean-field calculation of a two-flavor quark-meson model is compared with a renormalization group approach. However, due to the lack of confinement in this effective model the equation of state near the chiral phase transition is still unrealistic. A first improvement of this model can be achieved by coupling quark degrees of freedom to the Polyakov loop, consequently incorporating certain aspects of confinement. The influence of these modifications on the resulting phase diagram is discussed.

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