2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39568We study corrections to the photon-propagator in a recently proposed model, where gravity lives in 4+n dimensions and Standard Model fields in 4 dimensions. We find a correction to the form factor of the photon that can be constrained by QED tests.8 pages, Latex; Contents ChangedHigh Energy Physics - Phenomenologytext