Dark Matter from Split Seesaw

Details Dark Matter from Split Seesaw Dark Matter from Split Seesaw

2010-06-09

arxiv.org/abs/1006.1731v2

Physics Letters B 693 (2010) 144-148

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages. v2: references added, a version accepted by PLB

Scientific paper

10.1016/j.physletb.2010.08.031

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.

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