Baryogenesis and dark matter with vector-Like fermions

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23 Citations (Scopus)

Abstract

We show that vector-like fermions can act as the dark matter candidate in the universe whilst also playing a crucial role in electroweak baryogenesis through contributing to the barrier in the one-loop thermal scalar potential. In order for the new fermions to give rise to a strong first order phase transition, we show that one requires rather large Yukawa couplings in the new sector, which are strongly constrained by electroweak precision tests and perturbativity. Strong couplings between the dark matter candidate and the Higgs boson intuitively lead to small values of the relic density and problems with dark matter direct detection bounds. Nevertheless, when considering the most general realisation of the model, we Find regions in the parameter space that respect all current constraints and may explain both mysteries simultaneously.

Original languageEnglish
Article number176
Number of pages25
JournalJournal of High Energy Physics
Volume2013
Issue number10
DOIs
Publication statusPublished - 25 Oct 2013

Keywords

  • Cosmology of Theories beyond the SM
  • Higgs Physics

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