The Gamma-Ray Halo from Dark Matter Annihilations
Paolo Gondolo
Abstract
A sophisticated analysis of EGRET data has found evidence for gamma-ray emission from the galactic halo. I entertain the possibility that part of the EGRET signal is due to WIMP annihilations in the halo. I show that a viable candidate with the required properties exists in a model with an extended Higgs sector. The candidate has a mass of 2--4 GeV, a relic density Ω 0.1 (for a Hubble constant of 60 km/s/Mpc), and a scattering cross section off nucleons in the range 10-5--10-1 pb. The model satisfies present observational and experimental constraints, and makes strict predictions on the gamma-ray spectrum of the halo emission.
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