2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/188465We reanalyze the problem of particle creation in a 3+1 spatially closed Robertson-Walker space-time. We compute the total number of particles produced by this non-stationary gravitational background as well as the corresponding total energy and find a slight discrepancy between our results and those recently obtained in the literatureHigh Energy Physics - Theorytext