Thermodynamic properties of color superconducting quark matter

Thermodynamics for color superconducting quark matter is investigated on th e basis of the one-gluon-exchange model. Thermodynamic quantities are calcu lated by using a mean field (BCS) approximation. It is shown that there exi sts a phase transition of second order between the superconducting phase an d normal phase. The pressure and density become larger in the superconducti ng phase. The specific heat and compressibility have a discontinuity at the critical temperature.