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Susceptibilities and critical exponents within the Nambu--Jona-Lasinio model
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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. The comparisons between the critical exponents for the order parameters and the theoretical predictions are also included.
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Critical behavior and critical exponents of rotating QCD matter
In the two-flavor NJL model in mean field, the chiral critical endpoint in the temperature versus angular velocity plane shows standard mean-field exponents: alpha ~ 0, beta ~ 1/2, gamma ~ 1, delta ~ 3.
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