Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-04-10
Phys.Rev.D64:043503,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
26 pages, 7 figures; LaTeX; submitted to Physical Review D; minor typographical error corrected
Scientific paper
10.1103/PhysRevD.64.043503
The dark matter in the universe can be in the form of a superheavy matter species (WIMPZILLA). Several mechanisms have been proposed for the production of WIMPZILLA particles during or immediately following the inflationary epoch. Perhaps the most attractive mechanism is through gravitational particle production, where particles are produced simply as a result of the expansion of the universe. In this paper we present a detailed numerical calculation of WIMPZILLA gravitational production in hybrid-inflation models and natural-inflation models. Generalizing these findings, we also explore the dependence of the gravitational production mechanism on various models of inflation. We show that superheavy dark matter production seems to be robust, with Omega_X h^2 ~ (M_X / (10^11 GeV))^2 (T_RH / (10^9 GeV)), so long as M_X < H_I, where M_X is the WIMPZILLA mass, T_RH is the reheat temperature, and H_I is the expansion rate of the universe during inflation.
Chung Daniel J. H.
Crotty Patrick
Kolb Edward W.
Riotto Antonio
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