Takuya Kanazawa
Random matrix theory (RMT) provides a powerful framework for analyzing universal features of strongly coupled physical systems. In quantum chromodynamics (QCD), cold quark matter at asymptotically high density is expected to exhibit color superconductivity (CSC), the analogue of superconductivity in condensed-matter systems. Although CSC phases have been studied within RMT primarily in the macroscopic large-N limit, where N denotes the matrix size, it has remained unclear whether an RMT exists that realizes CSC in the microscopic large-N limit. Here we answer this question in the affirmative by introducing a novel non-Hermitian chiral random matrix model. For three quark flavors, we show that the model exhibits spontaneous breaking of color [Formula: see text] and flavor [Formula: see text] symmetries down to the diagonal [Formula: see text] subgroup, thereby reproducing color–flavor locking in dense QCD. For two flavors, we find that color [Formula: see text] is spontaneously broken to [Formula: see text] while the chiral symmetry [Formula: see text] remains unbroken, consistent with the two-flavor color-superconducting phase.