Susceptibilities and critical exponents within the Nambu--Jona-Lasinio model

Understand

In the mean field approximation of (2+1)-flavor Nambu--Jona-Lasinio model, we strictly derive several sets of coupled equations for the chiral susceptibility, the quark number susceptibility, etc.

• at finite temperature and quark chemical potential.
• The critical exponents of these susceptibilities in the vicinity of the QCD critical end point (CEP) are presented in SU(2) and SU(3) cases, respectively.
• It is found that these various susceptibilities share almost the same critical behavior near the CEP.