Gravitational production of super-Hubble-mass particles: an analytic approach

Abstract

Through a mechanism similar to perturbative particle scattering, particles of mass $m_{\chi }$ larger than the Hubble expansion rate $H_{\inf }$ during inflation can be gravitationally produced at the end of inflation without the exponential suppression powers of $\exp (-m_{\chi }/H_{\inf })$. Here we develop an analytic formalism for computing particle production for such massive particles. We apply our formalism to specific models that have been previously been studied only numerically, and we find that our analytical approximations reproduce those numerical estimates well.

v2: 24 pages, 1 figure. Refs added. Clarified discussion of time scales at Eq. (6.11)

References in corpus (4)

• Reheating in Inflationary Cosmology: Theory and Applications
• Nonperturbative Dynamics Of Reheating After Inflation: A Review
• Gravitational Effects on Inflaton Decay
• More hilltop inflation models

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