Enhancement of the dark matter abundance before reheating: Applications to gravitino dark matter

Marcos A. G. Garcia, Yann Mambrini, Keith A. Olive, and Marco Peloso
Phys. Rev. D 96, 103510 – Published 13 November 2017

Abstract

In the first stages of inflationary reheating, the temperature of the radiation produced by inflaton decays is typically higher than the commonly defined reheating temperature TRH(ΓϕMP)1/2 where Γϕ is the inflaton decay rate. We consider the effect of particle production at temperatures at or near the maximum temperature attained during reheating. We show that the impact of this early production on the final particle abundance depends strongly on the temperature dependence of the production cross section. For σvTn/Mn+2, and for n<6, any particle produced at Tmax is diluted by the later generation of entropy near TRH. This applies to cases such as gravitino production in low scale supersymmetric models (n=0) or NETDM models of dark matter (n=2). However, for n6 the net abundance of particles produced during reheating is enhanced by over an order of magnitude, dominating over the dilution effect. This applies, for instance to gravitino production in high scale supersymmetry models where n=6.

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  • Received 22 September 2017

DOI:https://doi.org/10.1103/PhysRevD.96.103510

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & AstrophysicsParticles & Fields

Authors & Affiliations

Marcos A. G. Garcia1, Yann Mambrini2, Keith A. Olive3,4, and Marco Peloso3

  • 1Physics and Astronomy Department, Rice University, Houston, Texas 77005, USA
  • 2Laboratoire de Physique Théorique Université Paris-Sud, F-91405 Orsay, France
  • 3School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
  • 4William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA

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Issue

Vol. 96, Iss. 10 — 15 November 2017

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