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Sterile neutrinos are attractive dark matter candidates. Their parameterspace of mass and mixing angle has not yet been fully tested despite intensiveefforts that exploit their gravitational clustering properties and radiativedecays. We use the limits on gamma-ray line emission from the Galactic Centerregion obtained with the SPI spectrometer on the INTEGRAL satellite to set newconstraints, which improve on the earlier bounds on mixing by more than twoorders of magnitude, and thus strongly restrict a wide and interesting range ofmodels.

Strong Upper Limits on Sterile Neutrino Warm Dark Matter