Right-handed sneutrinos as nonthermal dark matter

Shrihari Gopalakrishna*, André De Gouvêa, Werner Porod

*Corresponding author for this work

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

When the minimal supersymmetric standard model is augmented by three right-handed neutrino superfields, one generically predicts that the neutrinos acquire Majorana masses. We postulate that all supersymmetry (SUSY) breaking masses as well as the Majorana masses of the right-handed neutrinos are around the electroweak scale and, motivated by the smallness of neutrino masses, assume that the lightest supersymmetric particle (LSP) is an almost-pure right-handed sneutrino. We discuss the conditions under which this LSP is a successful dark matter candidate. In general, such an LSP has to be nonthermal in order not to overclose the universe, and we find the conditions under which this is indeed the case by comparing the Hubble expansion rate with the rates of the relevant thermalizing processes, including self-annihilation and co-annihilation with other SUSY and standard model particles.

Original languageEnglish (US)
Article number005
JournalJournal of Cosmology and Astroparticle Physics
Issue number5
DOIs
StatePublished - May 1 2006

Keywords

  • Cosmology of theories beyond the SM
  • Dark matter

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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