Chiral Phase Transition beyond Mean Field Approximation
Abstract
Based on the analogy between the Nambu--Jona-Lasinio model of chiral symmetry breaking and the BCS theory of superconductivity, we investigate the effect of q q pair fluctuations on the chiral phase transition. We include uncondensed q q pairs at finite temperature and chemical potential in a self-consistent T-matrix formalism, the so-called G0 G scheme. The pair fluctuations reduce significantly the critical temperature and make quarks massive above the critical temperature.
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