2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49053The instanton approach to spontaneous chiral symmetry breaking is reviewed, with emphasis on the connection to chiral random matrix theory. We extend the approach to discuss the finite density, zero-temperature behaviour of quark matter. Since the instanton-induced interactions are attractive in both $\bar{q}q$ 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.12 pages, 6 ps figures, includes ws-p8-50x6-00.cls; references addedHigh Energy Physics - Phenomenologytext