Massive quark propagator and competition between chiral and diquark condensate

The Green-function approach is extended to the moderate baryon density region in the framework of an extended Nambu–Jona-Lasinio model, and the thermodynamic potential with both chiral and diquark condensates evaluated by using the massive quark propagator. The phase structure along the chemical potential direction is investigated and the strong competition between the chiral and diquark condensate is analyzed by investigating the influence of the diquark condensate on the sharp Fermi surface. The influence of the diquark condensate on the quark properties is investigated, even though the quarks in the color-breaking phase are very different from those in the chiral-breaking phase; the difference between quarks in different colors is very small.