A possibility of a violation of a thermodynamic equilibrium in the early universe

Abstract

The evolution of superheated particles in the Friedmann universe is considered under the assumption of the asymptotic behavior of the scattering cross sections in the high-energy region. We show that there is no local thermodynamic equilibrium at early stages and conclude that the nature of cosmic rays can be explained on cosmological grounds. © 1986 Plenum Publishing Corporation.