2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/50211We study, through zeta-function techniques, the vacuum energies for Dirac fields in a constant magnetic background. We consider the combined effect of the background and twisted boundary conditions. The required charge renormalization is discussed in each case.Trabajo de Diploma. In Spanish. 43 pages. LateXHigh Energy Physics - Theorytext