Eternal annihilations of light photinos
Abstract
In a class of low-energy supersymmetry models the photino is a natural dark matter candidate. We investigate the effects of post-freeze-out photino annihilations which can generate electromognetic cascades and lead to photo-destruction of 4He and subsequent overproduction of D and 3He. We also generalize our analysis to a generic dark matter component whose relic abundance is not determined by the cross section of the self-annihilations giving rise to electromagnetic showers.
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