Exploring Sterile Neutrino Dark Matter Spectra

Recent observations of a 3.55 keV line in the stacked X-ray spectra of galaxies and galaxy clusters have an interesting interpretation as resulting from the decay of 7.1 keV sterile neutrino dark matter. However, calculations of resonant active-sterile neutrino transformation in the early universe that couples one active neutrino to the sterile state may produce momentum distributions that are inconsistent with the observed large scale structure. In this work, we explore the effects of different active-sterile neutrino coupling schemes on the sterile neutrino dark matter spectrum.