Relation Between Chiral Susceptibility and Solutions of Gap Equation in Nambu--Jona-Lasinio Model

Details Relation Between Chiral Susceptibility and Solutions of Gap Equation in Nambu--Jona-Lasinio Model Relation Between Chiral Susceptibility and Solutions of Gap Equation in Nambu--Jona-Lasinio Model

2006-10-26

arxiv.org/abs/hep-ph/0610358v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 6 figures, misprints are corrected

Scientific paper

We study the solutions of the gap equation, the thermodynamic potential and the chiral susceptibility in and beyond the chiral limit at finite chemical potential in the Nambu--Jona-Lasinio (NJL) model. We give an explicit relation between the chiral susceptibility and the thermodynamic potential in the NJL model. We find that the chiral susceptibility is a quantity being able to represent the furcation of the solutions of the gap equation and the concavo-convexity of the thermodynamic potential in NJL model. It indicates that the chiral susceptibility can identify the stable state and the possibility of the chiral phase transition in NJL model.

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