2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52755We review some general aspects of braneworld cosmologies in which an inflationary period driven by a scalar field confined on the brane is described by a nonstandard effective Friedmann equation. The perturbation spectra, consistency equations and observational consequences of these models are considered.8 pages, cargese.cls; contribution to Proceedings of Cargese Summer School 2004, NATO Science Series C; v2-3: typos correctedHigh Energy Physics - TheoryAstrophysicsGeneral Relativity and Quantum Cosmologytext