2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/117565We consider Kaluza-Klein theories as candidates for the unification of gravity and the electro-weak model. In particular, we fix how to reproduce geometrically the interaction between fermions and gauge bosons, in the low energy limit.3 pages, proceedings of the XI Marcel Grossmann meeting on Relativistic Astrophysics, July 23-29, 2006, BerlinGeneral Relativity and Quantum Cosmologytext