A mechanism for formation of Bose-Einstein condensation in cosmology.

Abstract

We introduce a toy model of scalar particles with a trilinear scalar coupling in cosmology. The trilinear coupling $\\phi^2\\chi$ causes production of non-relativistic $\\phi$ particles through the process $\\chi\\chi\\,\\rightarrow\\,\\phi\\phi$ where, initially, only relativistic $\\chi$ particles are present. We consider the initial times of $\\chi\\chi\\,\\rightarrow\\,\\phi\\phi$ and observe that the curved space effects promote formation of Bose-Einstein condensate of $\\phi$ particles.