Particle creation in the early Universe: achievements and problems

TL;DR

This paper reviews particle creation in the early Universe, providing exact solutions for particle and energy densities during expansion, and discusses the hypothesis that visible matter originates from decay of superheavy vacuum-created particles linked to dark matter.

Contribution

It offers exact solutions for particle creation in various expansion regimes and explores the hypothesis connecting vacuum-created superheavy particles to dark matter.

Findings

Finite particle and energy densities are obtained for different expansion regimes.

Results apply to both conformal and nonconformal particles.

Discussion on the origin of visible matter from vacuum-created superheavy particles.

Abstract

Results on particle creation from vacuum by the gravitational field of the expanding Friedmann Universe are presented. Finite results for the density of particles and the energy density for created particles are given for different exact solutions for different regimes of the expansion of the Universe. The results are obtained as for conformal as for nonconformal particles. The hypothesis of the origination of visible matter from the decay of created from vacuum superheavy particles identified with the dark matter is discussed.