Journal
PHYSICS LETTERS B
Volume 693, Issue 2, Pages 144-148Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2010.08.031
Keywords
Dark matter; Sterile neutrino; Extra dimensions
Funding
- DOE [DE-FG03-91ER40662]
- NASA [NNX08AL48G]
- JSPS [21740160]
- MEXT, Japan
- [21111006]
- [22244030]
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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 key 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 key, can account for the observed pulsar velocities and for the recent data from Chandra X-ray Observatory, which suggest the existence of a 5 key sterile right-handed neutrino. (C) 2010 Elsevier B.V. All rights reserved.
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