2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52124Intersecting D-brane worlds provide phenomenologically appealing constructions of four dimensional low energy string vacua. In this talk, a Z_4 x Z_2 orbifold background is taken into account. It is possible to obtain supersymmetric and stable chiral models. In particular, a three generation model with Pati-Salam gauge group and no exotic chiral matter is presented.Contribution to the proceedings of the "String Phenomenology 2003" conference, Durham July 29 - August 4, 2003, dedicated to the memory of Ian Kogan, 8 pages, 1 figureHigh Energy Physics - Theorytext