2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55181We discuss various D-brane configurations in 4-dimensional orbifold compactifications of type II superstring theory which are point-like 0-branes from the 4-dimensional space-time point of view. We analyze their interactions and compute the amplitude for the emission of a massless NSNS boson from them, in the case where the branes have a non vanishing relative velocity. In the large distance limit, we compare our computation to the expected field theory results, finding complete agreement.16 pages, LaTex, 5 figures. Talk presented by C. A. Scrucca at the conference "Physics beyond the standard model: from theory to experiment" in Valencia; to appear in the proceedingsHigh Energy Physics - Theorytext