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Cold positrons from decaying dark matter

Boubekeur, Lotfi; Dodelson, Scott; Vives, Oscar

Many models of dark matter contain more than one new particle beyond those in the Standard Model. Often, heavier particles decay into the lightest dark matter particle as the Universe evolves. Here, we explore the possibilities which arise if one of the products in a (heavyparticle)→(darkmatter) decay is a positron, and the lifetime is shorter tha…