COSMOLOGICAL DARK MATTER ANNIHILATIONS INTO γ-RAYS

We investigate the prospects of detecting weakly interacting massive particle (WIMP) dark matter by measuring the contribution to the extragalactic gamma-ray radiation induced, in any dark matter halo and at all redshifts, by WIMP pair annihilations into high-energy photons. Such signal has a very striking spectral signature and is less sensitive than other proposed signals to details about the distribution of WIMPs in dark halos.