2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/51314Two approaches to the study of cosmological perturbations in the brane-world scenario are compared: the first uses the 5D equations directly whereas the second approach projects them onto the 4D brane and then uses the effective 4D equations.4 pages, to appear in proceedings of the Moriond Workshop "The Cosmological Model", 16-23 March 2002High Energy Physics - Theorytext