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2015

A 3.55 keV Line from Exciting Dark Matter without a Hidden Sector

Berlin, Asher, DiFranzo, Anthony, Hooper, Dan

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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 of such a line from smaller halos, including dwarf galaxies.

In most of the XDM models discussed in the literature, this up-scattering is mediated by a new light particle, and dark matter annihilations proceed into pairs of this same light state.
In these models, the dark matter and mediator effectively reside within a hidden sector, without sizable couplings to the Standard Model.
In this paper, we explore a model of XDM that does not include a hidden sector.

A 3.55 keV Line from Exciting Dark Matter without a Hidden Sector · Around

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