A mechanism for formation of Bose-Einstein condensation in cosmology

英文摘要：

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