Nambu-Jona-Lasinio-based study of the QCD critical line

We employ a 3 flavor Nambu-Jona-Lasinio (NJL) model to stress some general remarks about the QCD critical line. The dependence of the critical curve on μq=(μu+μd)/2 and μI=(μu-μd)/2 is discussed. The quark masses are varied to confirm that, in agreement with universality arguments, the order of transition depends on the number of active flavors Nf. The slope of the critical curve vs chemical potential is studied as a function of Nf. We compare our results with those recently obtained in lattice simulations to establish a comparison among different models