Regular Article - Theoretical Physics
X-ray lines and self-interacting dark matter
Laboratoire de Physique Théorique, Université de Paris-Sud 11, CNRS-UMR 8627, 91405, Orsay Cedex, France
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Accepted: 10 November 2015
Published online: 30 November 2015
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 , 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.
© The Author(s), 2015