2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/7339Lecture notes on covariant linear perturbation theory and its applications to inflation, dark energy or matter and the cosmic microwave background.33 pages, 0 figures, summer school lectures: 2002 Astroparticle Physics and Cosmology, eds. G. Dvali et al. (Abdus Salam ICTP, Trieste, 2003) p. 149Astrophysicstext