Abstract
We calculate the relic density of very heavy, stable scalar neutrinos in the minimal supersymmetric standard model. We include all two-body final states, as well as the effects of co-annihilation with scalar electrons. We find that the sneutrino relic density is in the cosmologically interesting region 0.1 ⪅ Ω ν h 2 ⪅ 1.0 for 550 GeV ⪅ m ν ⪅ 2300 GeV . For nominal values of the parameters of our galactic halo, recent results from the Heidelberg-Moscow direct detection experiment set an upper limit on Ω ν which is lower by a factor ranging from two to ten, depending on m ν .
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