Abstract
We investigate effects of the vector interaction appearing in chiral effective Lagrangians on the chiral and color superconducting (CSC) phase transitions using Nambu-Jona-Lasinio model. It is shown that the repulsive density-density interaction coming from the vector term enhances competition between the chiral symmetry breaking (κSB) and CSC phase transition: When the vector coupling is increased, the first order transition between the κSB and CSC phase becomes weaker, and the coexisting phase in which both the chiral and color-gauge symmetries are dynamically broken comes to exisit in a wider region in the T- μ plane. We find that the critical line of the first order transition can have two endpoints for an intermediate range of the vector coupling.
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