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Phys Rev Lett. 2001 Dec 17;87(25):251301. Epub 2001 Nov 28.

Spectral gamma-ray signatures of cosmological dark matter annihilations.

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  • 1Department of Physics, Stockholm University, SCFAB, SE-106 91 Stockholm, Sweden.


We propose a new signature for weakly interacting massive particle (WIMP) dark matter, a spectral feature in the diffuse extragalactic gamma-ray radiation. This feature, a sudden drop of the gamma-ray intensity at an energy corresponding to the WIMP mass, comes from the asymmetric distortion of the line due to WIMP annihilation into two gamma rays caused by the cosmological redshift. Unlike other proposed searches for a line signal, this method is not very sensitive to the exact dark matter density distribution in halos and subhalos.

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