2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/151621We construct the low-energy effective theory for the SO(5) model of high-T_c superconductivity, recently proposed by S.C. Zhang (cond-mat/9610140). This permits us to develop a systematic expansion for low-energy observables in powers of the small symmetry-breaking interactions. The approximate SO(5) symmetry predicts relations amongst these observables, which are model-independent consequences of Zhang's proposed symmetry-breaking pattern.10 pages of TeXSuperconductivityHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext