2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/102704We briefly review different approaches used recently to describe collective effects in the strong pinning model of disordered charge and spin density waves, in connection with the CRTBT very low temperature heat relaxation experiments.4 pages, invited talk at ECRYS-2005Disordered Systems and Neural NetworksRecent results on energy relaxation in disordered charge and spin density wavestext