Constraints on sterile neutrinos as dark matter candidates from the diffuse X-ray background

Boyarsky, A. ; Neronov, A. ; Ruchayskiy, O. ; Shaposhnikov, M.

In: Monthly Notices of the Royal Astronomical Society, 2006, vol. 370, no. 1, p. 213-218

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    Sterile neutrinos with masses in the kilo-electronvolt range are viable candidates for the warm dark matter. We analyse existing data for the extragalactic diffuse X-ray background for signatures of sterile neutrino decay. The absence of a detectable signal within current uncertainties of background measurements puts model-independent constraints on allowed values of the sterile neutrino mass and mixing angle, which we present in this work