2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/94953We report results relating to the trinification scenario in some explicit string constructions that contain SU(3)^3 as a gauge symmetry. These models are obtained from symmetric Z_3 orbifolds of the SO(32) heterotic string with one discrete Wilson line. We highlight the obstacles that were encountered: the absence of the usual Higgs sector that would break SU(3)^3 \to SU(3)_c \times SU(2)_L \times U(1)_Y; the presence of exotics that would generically befoul gauge coupling unification and lead to fractionally-charged states in the low energy spectrum.1+7 pages, comments and refs addedHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext