2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52785Some of the phenomenological implications of string cosmological models are reviewed, with particular attention to the spectra of the tensor, scalar and vector modes of the geometry. A class of self-dual string cosmological models is presented. These solutions provide an effective description of cold bounces, where a phase of accelerated contraction smoothly evolves into an epoch of decelerated Friedmann--Robertson--Walker expansion dominated by the dilaton. Some of the general problems of the scenario (continuity of the perturbations, reheating, dilaton stabilization,...) can be successfully discussed in this framework.13 pages, 3 figures, Invited review (Third international Conference on Frontier Science), Rome June 2004High Energy Physics - Theorytext