Eternal annihilations of light photinos
Eternal annihilations of light photinos
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 that generate electromagnetic cascades and lead to photodestruction of $^{4}\mathrm{He}$ and subsequent overproduction of D and $^{3}\mathrm{He}$. We also generalize our analysis of electromagnetic showers to include those …