2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36218We study the influence of reheating on super-horizon density perturbations and gravitational waves. We correct wrong claims [L. P. Grishchuk Phys. Rev. D 50, 7154 (1994) and gr-qc/9801011] about the joining of perturbations at cosmological transitions and about the quantization of cosmological perturbations.Contributions to the XXXIIIrd Rencontres de Moriond, Fundamental Parameters in Cosmology, 5 pages, LatexGeneral Relativity and Quantum CosmologyAstrophysicstext