Gravitino dark matter in hybrid gauge-gravity models

Details Gravitino dark matter in hybrid gauge-gravity models Gravitino dark matter in hybrid gauge-gravity models

2009-07-29

arxiv.org/abs/0907.4985v1

JHEP 0911:113,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 20 pages 3 figures

Scientific paper

10.1088/1126-6708/2009/11/113

We study the phenomenology of generic supergravity models in which gravity mediation naturally competes with gauge mediation as the origin of supergravity-breaking. This class of hybrid models has been recently motivated in string inspired constructions and differs from usual gauge mediated supersymmetry breaking models in having messenger masses of order of the GUT scale. In these scenarios the gravitino can be the lightest supersymmetric particle in wide regions of the parameter space and therefore a potential candidate for dark matter. We investigate this possibility, imposing the WMAP bound on its relic abundance and taking into account constraints from Big Bang nucleosynthesis. We show that in these constructions viable gravitino dark matter can be obtained in specific regions of the parameter space, featuring large values of tan(beta) and where the supersymmetry breaking mechanism is dominated by gauge mediation.

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