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Constraints on sterile neutrino as a dark matter candidate from the diffuse X-ray background
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Sterile neutrinos with masses in the keV range are viable candidates for the warm dark matter. We analyze existing data for the extragalactic diffuse X-ray background for signatures of sterile neutrino decay. The absence of detectable signal within current uncertainties of background measurements puts model-independent constraints on allowed values of sterile neutrino mass and mixing angle, which we present in this work.
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NuSTAR Tests of Sterile-Neutrino Dark Matter: New Galactic Bulge Observations and Combined Impact
A 190 kilosecond NuSTAR search at high Galactic latitude finds no sterile-neutrino dark matter decay line and improves the leading upper limit by a factor of about two for 10-12 keV masses.
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