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A gamma-ray line observation would be a strong hint towards the detection ofdark matter. The possibility that a decay of the dark matter particle isresponsible for the emission of a line is investigated, for both a neutral anda millicharged dark matter. We focus here on a comparison of these twoscenarios, based on an effective field theory description and relying on cosmicray continuum constraints.

Neutral and Millicharged Dark Matter Decay into Gamma-Ray Lines