Evolution of the universe

A scenario of the evolution of the Universe based on the notions of the densities of the substance energy and the gravitational field in the Minkowski space is proposed. It is shown that the Universe evolves (in proper time) cyclically between states with maximal and minimal substance densities; the total energy density always vanishes. The complete period of the evolution cycle is determined by the minimal substance density in the Universe. It is also shown that, in the Riemannian space (by an observer associated with this space), the observed evolution process is a sequence of alternating cycles of expansion and contraction. At the final stage of expansion, which lasts for several billion years, the obtained value of the deceleration parameter is negative, which agrees with the most recent astronomical data. The distance to the horizon is determined by the current substance density. In the suggested concept, an explanation for the cosmological red shift is suggested; the temperature regime of the Universe is studied. A theoretical explanation for the observed non-Faraday rotation of the polarization planes of the electromagnetic radiation of distant radio galaxies is offered.