Dark Matter from Split Seesaw
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.
Cite
@article{arxiv.1006.1731,
title = {Dark Matter from Split Seesaw},
author = {Alexander Kusenko and Fuminobu Takahashi and Tsutomu T. Yanagida},
journal= {arXiv preprint arXiv:1006.1731},
year = {2014}
}
Comments
15 pages. v2: references added, a version accepted by PLB