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Asymmetric dark matter and effective number of neutrinos

Teruyuki Kitabayashi* and Yoshihiro Kurosawa†

  • Department of Physics, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan

  • *teruyuki@keyaki.cc.u-tokai.ac.jp
  • †4bsnm002@mail.tokai-u.jp
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Phys. Rev. D 93, 033002 – Published 4 February, 2016

DOI: https://doi.org/10.1103/PhysRevD.93.033002

Abstract

We study the effect of the MeV-scale asymmetric dark matter annihilation on the effective number of neutrinos Neff at the epoch of the big bang nucleosynthesis. If the asymmetric dark matter χ couples more strongly to the neutrinos ν than to the photons γ and electrons e−, Γχγ,χe≪Γχν, or Γχγ,χe≫Γχν, the lower mass limit on the asymmetric dark matter is about 18 MeV for Neff≃3.0.

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Phys. Rev. D 93, 033002– Published 4 February, 2016
  • Received 18 September 2015

© 2016 American Physical Society

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