Chiral Symmetry Restoration and $Z_N$ Symmetry

Abstract

We demonstrate that chiral symmetry restoration in quenched finite temperature QCD depends crucially on the $Z_3$ phase of the Polyakov loop $\mathcal{P}$. This dependence is a general consequence of the coupling of the chiral order parameter to the Polyakov loop. We construct a model for chiral symmetry breaking and restoration which includes the effect of a nontrivial Polyakov loop by calculating the effective potential for the chiral condensate of a Nambu-Jona-Lasinio model in a uniform temperature dependent $A_0$ gauge field background. Above the deconfinement temperature there are three possible phases corresponding to the $Z_3$ symmetric phases of the Polyakov loop in the pure gauge theory. In the phase in which $\mathrm{t}{\mathrm{r}}_{\mathrm{c}}(\mathcal{P})$ is real and positive the first order deconfining transition induces chiral symmetry restoration in agreement with simulation results. In the two phases where $Re[\mathrm{t}{\mathrm{r}}_{\mathrm{c}}(\mathcal{P})]<0$ the sign of the leading finite temperature correction to the effective potential is reversed from the normal phase, and chiral symmetry is not restored at the deconfinement transition; this agrees with the recent simulation studies of Chandrasekharan and Christ. In the case of $SU(N)$ a rich set of possibilites emerges. The generality of the mechanism makes it likely to occur in full QCD as well; this will increase the lifetimes of metastable $Z_3$ phases.

10 pages (LaTeX), 4 postscript figures, uuencoded

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• Z_N Phases in Hot Gauge Theories
• An Effective Action for Finite Temperature Lattice Gauge Theories with Dynamical Fermions
• CP Violating Metastable States and Baryogenesis in the Hot Standard Model

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