Abstract
We investigate the effects of pion and gluon exchanges on the formation of two-flavor color superconductivity at moderate density, $\ensuremath{\mu}<1 \mathrm{GeV}.$ The chiral quark model proposed by Manohar and Georgi containing pions as well as gluons is employed to show that the pion exchange reduces substantially the value of the superconducting gap obtained with the gluon exchange only. It turns out that the pion exchanges produce a repulsion between the quark-quark pair in a spin and isospin singlet state. We suggest that the phase consisting of pions, gluons, and quarks is one of the candidates of the in-medium QCD phase at moderate density.
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