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.
The 7 keV axion dark matter and the X-ray line signal
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abstract
We propose a scenario where the saxion dominates the energy density of the Universe and reheats the standard model sector via the dilatonic coupling, while its axionic partner contributes to dark matter decaying into photons via the same operator in supersymmetry. Interestingly, for the axion mass $m_a \simeq 7$keV and the decay constant $f_a \simeq 10^{14-15}$GeV, the recently discovered X-ray line at $3.5$keV in the XMM Newton X-ray observatory data can be explained. We discuss various cosmological aspects of the $7$keV axion dark matter such as the production of axion dark matter, the saxion decay process, hot dark matter and isocurvature constraints on the axion dark matter, and the possible baryogenesis scenarios.
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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.