Abstract
We study the correlation between a monochromatic signal from annihilating dark matter and its self-interacting cross section. We apply our argument to a complex scalar dark sector, where the pseudo-scalar plays the role of a warm dark matter candidate while the scalar mediates its interaction with the Standard Model. We combine the recent observation of the cluster Abell 3827 for self-interacting dark matter and the constraints on the annihilation cross section for monochromatic X-ray lines. We also confront our model to a set of recent experimental analyses and find that such an extension can naturally produce a monochromatic keV signal corresponding to recent observations of Perseus or Andromeda, while in the meantime it predicts a self-interacting cross section of the order of sigma /m simeq 0.1{-}1~mathrm {cm^2/g}, as recently claimed in the observation of the cluster Abell 3827. We also propose a way to distinguish such models by future direct detection techniques.
Highlights
A possible smoking gun signature of the interaction of dark matter in our galaxy or in larger structure would be the observation of a monochromatic signal generated by the annihilation or the decay of the candidate
We study the correlation between a monochromatic signal from annihilating dark matter and its selfinteracting cross section
We apply our argument to a complex scalar dark sector, where the pseudo-scalar plays the role of a warm dark matter candidate while the scalar mediates its interaction with the Standard Model
Summary
A possible smoking gun signature of the interaction of dark matter in our galaxy or in larger structure would be the observation of a monochromatic signal (photon, neutrino or positron) generated by the annihilation or the decay of the candidate. If the X-ray line excess discussed above is interpreted as a dark matter signal, the same excess should be observed from the other galaxies such as the Milky Way, M31, and dwarf spheroidal galaxies in addition to the Perseus and Centaurus clusters. We would like to insist that beyond the 3.5 keV signal consideration (one does not need to agree with the dark matter interpretation of the line or the self-interacting dark matter observations) the aim of our work is more general.
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