An asymptotic approximation of the Fokker–Planck model of evolution of superthermal ultrarelativistic particles in the presence of interaction scaling

The evolution of a superthermal relict plasma component is studied using a nonequilibrium model of the Universe 1] and a kinetic equation of the Fokker–Planck type 2]. Given is the evidence of two maxima in the distribution of superthermal particles. The first maximum can further evolve into an equilibrium distribution, whereas the second one can result in a high-energy tail of superthermal relict particles. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 87–91, February, 2009.