2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36423Friedmann-Robertson-Walker cosmological models with a massive scalar field are studied in the presence of hydrodynamical matter in the form of a perfect fluid. The ratio of the number of solutions without inflation to the total number of solutions is evaluated, depending on the fluid density. It is shown that in a closed model this ratio can reach 60%, by contrast to $\sim 30 %$ in models without fluid.9 pages with 2 eps figures, to appear in Gravitation and CosmologyGeneral Relativity and Quantum Cosmologytext