Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-02-02
JCAP 0605 (2006) 005
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages v.2: References added
Scientific paper
10.1088/1475-7516/2006/05/005
When the minimal supersymmetric standard model is augmented by three right-handed neutrino superfields, one generically predicts that the neutrinos acquire Majorana masses. We postulate that all supersymmetry (SUSY) breaking masses as well as the Majorana masses of the right-handed neutrinos are around the electroweak scale and, motivated by the smallness of neutrino masses, assume that the lightest supersymmetric particle (LSP) is an almost-pure right-handed sneutrino. We discuss the conditions 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 we find the conditions under which this is indeed the case by comparing the Hubble expansion rate with the rates of the relevant thermalizing processes, including self-annihilation and co-annihilation with other SUSY and standard model particles.
Gopalakrishna Shrihari
Gouvea Andre de
Porod Werner
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