http://arxiv.org/abs/1506.02032
We show that there exists a strong correlation between monochromatic signals 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 the dark matter candidate while the scalar is the mediator particle. Intriguingly, we find that such an extension produces naturally a monochromatic keV signal which can correspond to recent observations of Perseus or Andromeda while in the meantime predicts self-interacting cross section of the order of $\sigma/m \simeq 0.1-1~\mathrm{cm^2/g}$ measured recently in the cluster Abell 3827, without the need of invoking strong interaction or velocity enhancement. We also propose a way to distinguish such models by future direct detection techniques.
Y. Mambrini and T. Toma
Tue, 9 Jun 15
27/56
Comments: 9 pages, 5 figures
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