2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/149347In this lecture I will report on some recent progress in understanding the relation of Dirac operators on Clifford modules over an even-dimensional closed Riemannian manifold $M$\ and (euclidean) Einstein-Yang-Mills-Higgs models.8 pages, plain tex, Lecture at the IV th Conference on Clifford Algebras and their Applications in Mathematical Physics, Aachen, Germany, May 28 - 31, 1996, some misprints in corollary 4 and (16) correctedHigh Energy Physics - Theorytext