Radiation and Matter in an Open Cosmological Model

Abstract

THE discovery¹ of the cosmic background radiation has stimulated research on the cosmological model with both matter and radiation². As usually used the Friedmann solutions correspond either to pressureless matter alone or to radiation alone Here a(τ) is a scale factor of the line element and A_m, A_r are constants. These equations describe an open model with negative curvature. It seems reasonable to consider an open model because of a number of observational and theoretical arguments³. Here I consider some properties of the analytical solution for the open cosmological model containing both radiation and matter.