2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/108780I propose that the primordial baryon asymmetry of the universe was induced by the presence of a non-vanishing antisymmetric field background H_ijk across the three space dimensions. This background creates a dilute (B-L)-number density in the universe cancelling the contribution from baryons and leptons. This situation naturally appears if the U(1)_{B-L} symmetry is gauged and the corresponding gauge boson gets a Stuckelberg mass by combining with an antisymmetric field B_ij. All these ingredients are present in D-brane models of particle physics. None of the Sakharov conditions are required.11 pages, Latex file, no figuresHigh Energy Physics - TheoryAstrophysicsHigh Energy Physics - Phenomenologytext