Particle production and classical condensates in de Sitter space
Particle production and classical condensates in de Sitter space
The cosmological particle production in a $k=0$ expanding de Sitter universe with a Hubble parameter ${H}_{0}$ is considered for various values of mass or conformal coupling of a free, scalar field. One finds that, for a minimally coupled field with mass $0<~{m}^{2}<{9H}_{0}^{2}/4$ (except for ${m}^{2}{=2H}_{0}^{2})$, the one-mode occupation number grows …