Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-12-18
Phys.Lett.B588:7-16,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, 12 figures, reference added
Scientific paper
10.1016/j.physletb.2004.03.021
We consider the possibility that the gravitino might be the lightest supersymmetric particle (LSP) in the constrained minimal extension of the Standard Model (CMSSM). In this case, the next-to-lightest supersymmetric particle (NSP) would be unstable, with an abundance constrained by the concordance between the observed light-element abundances and those calculated on the basis of the baryon-to-entropy ratio determined using CMB data. We modify and extend previous CMSSM relic neutralino calculations to evaluate the NSP density, also in the case that the NSP is the lighter stau, and show that the constraint from late NSP decays is respected only in a limited region of the CMSSM parameter space. In this region, gravitinos might constitute the dark matter.
Ellis John
Olive Keith A.
Santoso Yudi
Spanos Vassilis
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