2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/10578Cosmic strings provide a radically different paradigm for the formation of structure to the prevailing inflationary one. They afford some extra technical complications: for example, the calculation of the power spectrum of matter and radiation perturbations requires the knowledge of the history of the evolution of the defects in the form of two-time correlation functions. We describe some numerical simulations of string networks, designed to measure the two-time correlations during their evolution.6pp Plain LaTeX, 4 EPS figures, uses epsf.sty, cmb.sty (included). Proceedings of CMB Workshop, Moriond 96AstrophysicsHigh Energy Physics - Phenomenologytext