CPOD International Workshop at GSI Darmstadt
July 9 - 13, 2007 -
Registered Participants Information

Title:	Dr.
Last Name:	Megias
First Name:	Eugenio
E-Mail:	emegiasquark.phy.bnl.gov
Affiliation for Badge:	Brookhaven National Laboratory
Institute:	Physics Department, Brookhaven National Laboratory
Address (Street):	20 Pennsylvanie Avenue
Postal Code, City:	11973, Upton
Country:	United States
Phone:	(001) 631-344-2365
Fax:	(001) 631-344-5568
Arrival Date:	July 8
Departure Date:	July 14
Hotel Information:	GSI Guesthouse and Hostel
Payment:	Cash at the conference site
Contribution
Author(s):	E. Megias, E. Ruiz Arriola and L.L. Salcedo
Institute(s):	Brookhaven National Laboratory and University of Granada.
Title:	Polyakov loop effects in QCD and chiral quark models.
Abstract:	We discuss the importance of the inclusion of the Polyakov loop in computations 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)