Abstract
When the minimal supersymmetric standard model is augmented by three right-handedneutrino superfields, one generically predicts that the neutrinos acquire Majorana masses.We postulate that all supersymmetry (SUSY) breaking masses as well as theMajorana masses of the right-handed neutrinos are around the electroweak scaleand, motivated by the smallness of neutrino masses, assume that the lightestsupersymmetric particle (LSP) is an almost-pure right-handed sneutrino. We discuss theconditions under which this LSP is a successful dark matter candidate. In general,such an LSP has to be nonthermal in order not to overclose the universe, and wefind the conditions under which this is indeed the case by comparing the Hubbleexpansion rate with the rates of the relevant thermalizing processes, includingself-annihilation and co-annihilation with other SUSY and standard model particles.
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