TY - JOUR
T1 - Dark matter from split seesaw
AU - Kusenko, Alexander
AU - Takahashi, Fuminobu
AU - Yanagida, Tsutomu T.
N1 - Funding Information:
F.T. thanks Antonio Riotto and CERN Theory Group for the warm hospitality while part of this work was completed. A.K. was supported by DOE Grant DE-FG03-91ER40662 and NASA ATP Grant NNX08AL48G . The work of F.T. was supported by the Grant-in-Aid for Scientific Research on Innovative Areas (No. 21111006 ) and Scientific Research (A) (No. 22244030 ), and JSPS Grant-in-Aid for Young Scientists (B) (No. 21740160 ). This work was supported by World Premier International Center Initiative (WPI Program), MEXT , Japan. A.K. thanks Aspen Center for Physics for hospitality.
PY - 2010/9
Y1 - 2010/9
N2 - 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.
AB - 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.
KW - Dark matter
KW - Extra dimensions
KW - Sterile neutrino
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U2 - 10.1016/j.physletb.2010.08.031
DO - 10.1016/j.physletb.2010.08.031
M3 - Article
AN - SCOPUS:77956922064
VL - 693
SP - 144
EP - 148
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 2
ER -