Two types of scenarios for the evolution of the universe

Scenarios for the evolution of the universe can be grouped into two classes: those in which the universe originates from a singularity at t = 0 and those in which the universe continues through a singularity. It is shown that the scenarios of this second type correspond well to the observed data. The entropy difficulties can be eliminated in a scenario which involves the condensation of extremely low-density matter, with a conversion into an open model due to the energy evolved during condensation of the matter into galaxies.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 103–106, June, 1984.