2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55880Different models with nonabelian homogeneous condensate fields are considered in the one-loop approximation. Effective action in a model of gluodynamics in curved space is calculated. Free energy and its minimum in a (2+1)-dimensional model of QCD are investigated. Photon polarization operator (PO) is obtained.6 pages, LATEX Talk presented at the Fourth International Workshop on Quantum Theory under the Influence of External Conditions, Leipzig University, Leipzig, September 1998High Energy Physics - Theorytext