2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39223External (hyper)magnetic field can modify the phase structure in U(1) gauge+Higgs (Landau-Ginzburg) and SU(2)xU(1) gauge+Higgs (Standard Model) theories. In this talk I discuss how the magnetic field can be implemented on the lattice, and summarize the effects on symmetry breaking phase transitions.6 pages; talk given at the ECT* conference 'Understanding Deconfinement in QCD', Trento, Italy, March 1999High Energy Physics - Latticetext