2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34656Quantum Mechanics at Planck scale is considered as a deformation of the conventional Quantum Mechanics. Similar to the earlier works of the author, the main object of deformation is the density matrix. On this basis a notion of the entropy density is introduced that is a matrix value used for a detail study of the Information Problem at the Universe, and in particular, for the Information Paradox Problem.9 pages,no figures,some correctionsGeneral Relativity and Quantum Cosmologytext