2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/53044Solutions of matrix quantum mechanics have been shown to describe time dependent backgrounds in the holographically dual two dimensional closed string theory. We review some recent work dealing with non-trivial space-times which arise in this fashion and discuss aspects of physical phenomena in them.15 pages, 6 figures. Based on talk at "International Workshop on String Theory", Khajuraho, December 2004High Energy Physics - Theorytext