Can decaying sterile neutrinos account for all dark matter?

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The recent discovery of unexplained X-ray line of $3.5-3.6$ keV emitted from the Perseus cluster of galaxies and M31 and the excess X-ray line of $8.7$ keV emitted from the Milky Way center may indicate that dark matter would decay.

• In this article, I show that approximately 80 \% of dark matter being 7.1 keV sterile neutrinos and 20 \% of dark matter being 17.4 keV sterile neutrinos can satisfactorily explain the observed X-ray lines and account for all missing mass.
• No free parameter is needed in this model.
• This scenario is also compatible with current robust observational constraints from the matter power spectrum in large-scale structures and would alleviate the challenges faced by the existing dark matter models.