2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/184298We investigate the emission of gravitons by a cosmological brane into an Anti de Sitter five-dimensional bulk spacetime. We focus on the distribution of gravitons in the bulk and the associated production of `dark radiation' in this process. In order to evaluate precisely the amount of dark radiation in the late low-energy regime, corresponding to standard cosmology, we study numerically the emission, propagation and bouncing off the brane of bulk gravitons.27 pages, 5 figures, minor corrections. Final versionHigh Energy Physics - TheoryAstrophysicsHigh Energy Physics - Phenomenologytext