Polyakov loop effects in QCD and chiral quark models
Seminar Room 1, Newton Institute
We discuss the importance of the inclusion of the Polyakov loop in computation of observables in QCD at finite temperature. In the deconfinement phase it is possible to obtain a fully gauge invariant effective action of QCD, which means invariance under large gauge symmetries, and it is necessary to consider the Polyakov loop. In the confinement phase of QCD, traditional Chiral Quark Models become inconsistent with Chiral Perturbation Theory at finite temperature, they predict deconfinement even at low temperature, etc. These problems can be solved if we consider the coupling of the Polyakov loop in these models. In particular, the Polyakov-NJL model predicts a phase transition which agrees very well with lattice data, if we consider a convenient non-perturbative parametrization for the distribution of the Polyakov loop in pure gluodynamics. The main theoretical justification of Polyakov-Chiral Quark Models is large gauge invariance. Some references are: E. Megias, E. Ruiz Arriola and L.L. Salcedo PLB563:173-178(2003), PRD69:116003(2004), PRD74:065005(2006), PRD74:114014(2006), JHEP0601:073(2006), PRD75:105019(2007).
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