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Abelian dark matter models for 511 keV gamma rays and direct detection

We construct a simple U(1) hidden sector model of metastable dark matter that could explain excess 511 keV gamma rays from the galactic center as observed by INTEGRAL, through inelastic scattering of dark matter followed by its decay. Although the model is highly constrained, it naturally accommodates dark matter with mass and cross section in the range suggested by the CoGeNT and CRESST experiments. The dark gauge boson that mediates the interactions with standard model matter has a mass of several hundred MeV, and might be discovered by heavy photon detection experiments, including APEX, MAMI and HPS.

preprint2012arXivOpen access
James M. ClineAndrew R. Frey
astro-ph.COhep-phastro-ph.GA
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James M. ClineAndrew R. Frey

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