2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46852At an elementary level, we present some non-perturbative aspects of non-abelian gauge theories in four dimensional space-time. Some rigorous results have been obtained in the framework of supersymmetric theories, and a very rich physics related to the strong-coupling dynamics of gauge fields has been discovered. Some of the new phenomena which appeared may play a significant role in future phenomenological models. However, quantitative computations in non-supersymmetric theories, like quantum chromodynamics, is out of reach for the moment.2 pages, in french, to appear in the proceedings of the ``5eme journees des jeunes chercheurs,'' Autrans, 1996High Energy Physics - PhenomenologyHigh Energy Physics - Theorytext