Instanton-induced interactions in finite density QCD: from chiral symmetry breaking to colour superconductivity Original Research Article

We consider the finite density, zero-temperature behaviour of quark matter in the instanton picture. Since the instanton-induced interactions are attractive in both View the MathML source and qq channels, a competition ensues between phases of matter with condensation in either or both. It results in chiral symmetry restoration due to the onset of diquark condensation, a ‘colour superconductor’, at finite density.