Search for a photon peak from keV-scale dark matter annihilation with NuSTAR: Constraints on $⟨\sigma v⟩$ after 11 years of observations

E. I. Zakharov, V. V. Barinov, D. S. Gorbunov +2

We report new constraints on the velocity-independent annihilation cross section $⟨\sigma v⟩$ of keV-scale dark matter particles based on 11 years of observations with the…