Strong Upper Limits on Sterile Neutrino Warm Dark Matter

Details Strong Upper Limits on Sterile Neutrino Warm Dark Matter Strong Upper Limits on Sterile Neutrino Warm Dark Matter

2007-06-27

arxiv.org/abs/0706.4084v2

Phys.Rev.Lett.101:121301,2008

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures; minor revisions, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.101.121301

Sterile neutrinos are attractive dark matter candidates. Their parameter space of mass and mixing angle has not yet been fully tested despite intensive efforts that exploit their gravitational clustering properties and radiative decays. We use the limits on gamma-ray line emission from the Galactic Center region obtained with the SPI spectrometer on the INTEGRAL satellite to set new constraints, which improve on the earlier bounds on mixing by more than two orders of magnitude, and thus strongly restrict a wide and interesting range of models.

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