2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43121The violation of Lorentz symmetry can arise in a variety of approaches to fundamental physics. For the description of the associated low-energy effects, a dynamical framework known as the Standard-Model Extension has been developed. This talk gives a brief review of the topic focusing on Lorentz violation through varying couplings.4 pages; talk given at the EURESCO conference "What Comes Beyond the Standard Model" in Portoroz, Slovenia, July 2003High Energy Physics - Phenomenologytext