2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/56421One-loop calculations in quantum gravity coupled to U(1)-Abelian fields (photon fields) are ultraviolet finite and cutoff-free in the framework of causal perturbation theory. We compute the photon loop correction to the graviton propagator and the photon self-energy in second order perturbation theory. Perturbative gauge invariance to second order is shown and generates the gravitational Slavnov-Ward identities.22 pages, latex, no figures, some typos corrected, introduction enlargedHigh Energy Physics - Theorytext