3.55 keV line from exciting dark matter without a hidden sector
3.55 keV line from exciting dark matter without a hidden sector
Models in which dark matter particles can scatter into a slightly heavier state which promptly decays to the lighter state and a photon (known as eXciting Dark Matter, or XDM) have been shown to be capable of generating the 3.55 keV line observed from galaxy clusters, while suppressing the flux …