2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36644General relativity is unable to determine the topology of the Universe. We propose to apply quantum approach. Quantization of dynamics of a test particle is sensitive to the spacetime topology. Presented results for a particle in de Sitter spacetimes favor a finite universe.Presented at the Workshop `Connecting Fundamental Physics and Cosmology', Cambridge, U.K., 23-27 August 1999; 5 pages, LaTeX2e, no figuresGeneral Relativity and Quantum Cosmologytext