2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/51479We investigate a system of 1,3, and 7-branes in type IIB string theory. We identify the 1-brane with the vortex of the Abelian Higgs model. We claim that in the S-dual, the theory on the 3-brane confines electric flux which we identify with the fundamental string and that the dual photon has a mass. We then investigate ways of breaking supersymmetry in the brane set up.5 pages, 1 figureHigh Energy Physics - Theorytext