2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48598In the physical vacuum of QCD, the energy density of light-quark fields strongly coupled to slowly varying gluon fields can be negative, and so a condensate of pairs of quarks and antiquarks of nearly opposite momenta forms which breaks chiral symmetry, confines quarks, and makes gluons massive.10 pages, latex, very minor changesHigh Energy Physics - Phenomenologytext