Color superconductivity in the Nambu Jona-Lasinio model complemented by a Polyakov loop

Abstract

The color superconductivity was studied with an adaptation of the Nambu and Jona-Lasinio model (NJL). This one was coupled to a Polyakov loop, to form the PNJL model. A $\mu$-dependent Polyakov loop potential was considered. An objective of the presented works was to describe the analytical calculations required to establish the equations to be solved, in all of the treated cases. They concerned the normal quark phase, the 2-flavor color-superconducting and the color-flavor-locked phases, in an SU(3)f X SU(3)c description. The calculations were performed according to the temperature T, the chemical potentials ${\mu }_f$ or according to the densities ${\rho }_f$, with or without the isospin symmetry. Among the obtained results, it was found that at low T, the restoration of the chiral symmetry, the deconfinement transition and the transition between the normal quark and 2-flavor color-superconducting phases occur via first order phase transitions at the same chemical potential. Moreover, an sSC phase was identified in the ${\rho }_q$, ${\rho }_s$ plane.

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