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Journal of High Energy Physics

, 2018:42 | Cite as

Neutralino dark matter in scenarios with early matter domination

  • Manuel Drees
  • Fazlollah HajkarimEmail author
Open Access
Regular Article - Theoretical Physics

Abstract

We investigate the production of neutralino dark matter in a cosmological scenario featuring an early matter dominated era ending at a relatively low reheating temperature. In such scenarios different production mechanisms of weakly interacting massive particles (WIMPs), besides the well-studied thermal production, can be important. This opens up new regions of parameter space where the lightest neutralino, as the best-known supersymmetric (SUSY) WIMP, obtains the required relic abundance. Many of these new sets of parameters are also compatible with current limits from colliders as well as direct and indirect WIMP searches. In particular, in standard cosmology bino-like neutralinos, which emerge naturally as lightest neutralino in many models, can have the desired relic density only in some finetuned regions of parameter space where the effective annihilation cross section is enhanced by co-annihilation or an s-channel pole. In contrast, if the energy density of the universe was dominated by long-lived PeV-scale particles (e.g. moduli or Polonyi fields), bino-like neutralinos can obtain the required relic density over wide regions of supersymmetric parameter space. We identify the interesting ranges of mass and decay properties of the heavy long-lived particles, carefully treating the evolution of the temperature of the thermal background.

Keywords

Supersymmetry Phenomenology Strings and branes phenomenology 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2018

Authors and Affiliations

  1. 1.Bethe Center for Theoretical Physics and Physikalisches InstitutUniversität BonnBonnGermany

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