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

Symmetry

Pedro Costa¹  Maria C. Ruivo¹  Célia A. De Sousa¹ 

[1] ¹Centro de Física Computacional, Departamento de Física , Universidade de Coimbra, P-3004-516 Coimbra, Portugal ²E.S.T.G., Instituto Politécnico de Leiria, Morro do Lena-Alto do Vieiro, 2411-901 Leiria, Portugal ³IPNL, Université de Lyon/Université Lyon 1, CNRS/IN2P3, 4 rue E.Fermi, F-69622 Villeurbanne Cedex, France

关键词: chiral symmetry;    phase transition;    restoration of symmetry;   

DOI  :  10.3390/sym2031338

来源: mdpi

【 摘 要 】

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, μB) 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.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.