Abstract
The thermodynamics of quark matter consisting of two light flavors (up and down) in the instanton vacuum is investigated at finite chemical potential (μ) and partly at finite temperature. The derivation of the instanton-induced interaction is performed by a method based on the LSZ reduction formula, which is a new procedure for the case of finite μ. The finite μ form factors arising from zero mode quarks are calculated without approximation. Phase structures for N c = 3 and N c =: 2 are investigated using the thermodynamic potential in the mean-field approximation. It is found that in most cases the double-condensate phase, in which both chiral and diquark condensates coexist, can be realized between the pure chiral condedsate and pure diquark condensate phases. In addition, several thermodynamic quantities, including occupation numbers, quark number densities and the latent heat in the chiral phase transition, are also computed numerically.
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