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Improved limits on sterile neutrino dark matter using full-sky Fermi Gamma-ray Burst Monitor data

Ng, Kenny C. Y.; Horiuchi, Shunsaku; Gaskins, Jennifer M. +2 more

A sterile neutrino of ∼keV mass is a well-motivated dark matter candidate. Its decay generates an x-ray line that offers a unique target for x-ray telescopes. For the first time, we use the Gamma-ray Burst Monitor (GBM) onboard the Fermi Gamma-Ray Space Telescope to search for sterile neutrino decay lines; our analysis covers the energy range 10-2…