The chiral phase transition and the role of vacuum fluctuations

Details The chiral phase transition and the role of vacuum fluctuations The chiral phase transition and the role of vacuum fluctuations

2011-02-14

arxiv.org/abs/1102.2779v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages 5figs

Scientific paper

We apply optimized perturbation theory to the quark-meson model at finite temperature T and quark chemical potential mu. The effective potential is calculated to one loop both in the chiral limit and at the physical point and used to study the chiral dynamics of two-flavor QCD. The critical temperature and the order of the phase transition depends heavily on whether or not one includes the bosonic and fermionic vacuum fluctuations in the effective potential. A full one-loop calculation in the chiral limit predicts a first-order transition for all values of mu. At the physical point, one finds a crossover in the whole $\mu-T$ plane.

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