2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/120552It is suggested that the properties of the mass spectrum of elementary particles could be related with cosmology. Solutions of the Klein-Gordon equation on the Friedmann type manifold with the finite action are constructed. These solutions (actons) have a discrete mass spectrum. We suggest that such solutions could select a universe from cosmological landscape. In particular the solutions with the finite action on de Sitter space are investigated.8 pages, Based on talks given at "Quarks-2006" St. Petersburg, Russia, 19-25 May, 2006; "Beyond the Quantum", 29 May 2006 - 2 June 2006, Leiden Universitet, The Netherlands; " Quantum Theory: Reconsideration of Foundations-3", June 4- 9, 2006, Vaxjo Universitet, Sweden; IV Summer School in Modern Mathematical Physics, 3 - 14 September 2006, Belgrade, SerbiaHigh Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext