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Phase Diagram and Critical Properties within an Effective Model of QCD: The Nambu-Jona-Lasinio Model Coupled to the Polyakov Loop

Authors: Pedro Costa, Maria C. Ruivo, CĂ©lia A. de Sousa and Hubert Hansen

Ref.: Symmetry (Special Issue Symmetry Breaking Phenomena) 2(3), 1338-1374 (2010)

Abstract: We investigate the phase diagram of the so-called Polyakov--Nambu--Jona-Lasinio model at finite temperature and non-zero chemical potential with three quark flavors. Chiral and deconfinement phase transitions are discussed and the relevant order-like parameters are analyzed. The results are compared with simple thermodynamic expectations and lattice data. We present the phase diagram in the (T,\mu_B) plane, paying special attention to the critical end point: as the strength of the flavor-mixing interaction becomes weaker, the critical end point moves to low temperatures and can even disappear.

DOI: 10.3390/sym2031338