In a Fierz-complete NJL model with neutrality constraints, scalar-isovector, vector-isovector, and vector-isovector-color-octet channels significantly shape the two-flavor color-superconducting phase diagram, and an intermediate gapless 2SC phase appears.
Discussions on the crossover property within the Nambu--Jona-Lasinio model
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In this paper, chiral symmetry breaking and its restoration are investigated in the mean field approximation of Nambu--Jona-Lasinio model. A first-order phase transition exists at low temperature, but is smeared out at high temperature. We discuss the rationality of using susceptibilities as the criteria to determine the crossover region as well as the critical point. Based on our results, it is found that to define a critical band instead of an exclusive line in this region might be a more suitable choice.
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Two-flavor color superconductivity in a general Nambu-Jona-Lasinio model with color and charge neutrality
In a Fierz-complete NJL model with neutrality constraints, scalar-isovector, vector-isovector, and vector-isovector-color-octet channels significantly shape the two-flavor color-superconducting phase diagram, and an intermediate gapless 2SC phase appears.