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3.5-keV X-ray line from nearly-degenerate WIMP dark matter decays · Around

2014

3.5-keV X-ray line from nearly-degenerate WIMP dark matter decays

Chiang, Cheng-Wei, Yamada, Toshifumi

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The unidentified emission line at the energy of $\sim$3.5~keV observed in X-rays from galaxy clusters may originate from a process involving a dark matter particle.

On the other hand, a weakly interacting massive particle (WIMP) has been an attractive dark matter candidate, due to its well-understood thermal production mechanism and its connection to physics at the TeV scale.
In this paper, we pursue the possibility that the 3.5-keV X-ray arises from a late time decay of a WIMP dark matter into another WIMP dark matter, both of which have the mass of $O(100)$~GeV and whose mass splitting is about 3.5~keV.
We focus on the simplest case where there are two Majorana dark matter particles and two charged scalars that couple with a standard model matter particle.

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