Dark matter from split seesaw

Alexander Kusenko, Fuminobu Takahashi, Tsutomu T. Yanagida

Research output: Contribution to journalArticlepeer-review

103 Citations (Scopus)

Abstract

The seesaw mechanism in models with extra dimensions is shown to be generically consistent with a broad range of Majorana masses. The resulting democracy of scales implies that the seesaw mechanism can naturally explain the smallness of neutrino masses for an arbitrarily small right-handed neutrino mass. If the scales of the seesaw parameters are split, with two right-handed neutrinos at a high scale and one at a keV scale, one can explain the matter-antimatter asymmetry of the universe, as well as dark matter. The dark matter candidate, a sterile right-handed neutrino with mass of several keV, can account for the observed pulsar velocities and for the recent data from Chandra X-ray Observatory, which suggest the existence of a 5 keV sterile right-handed neutrino.

Original languageEnglish
Pages (from-to)144-148
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume693
Issue number2
DOIs
Publication statusPublished - 2010 Sep 1
Externally publishedYes

Keywords

  • Dark matter
  • Extra dimensions
  • Sterile neutrino

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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