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Título

Gravitino dark matter in hybrid gauge-gravity models

AutorCerdeño, David G. ; Mambrini, Yann; Romagnoni, Alberto
Palabras claveSupersymmetry Breaking
Supergravity Models
Cosmology of Theories beyond the SM
Compactification and String Models
Fecha de publicaciónnov-2009
EditorInstitute of Physics Publishing
CitaciónJournal of High Energy Physics 11(113): (2009)
ResumenWe 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 β and where the supersymmetry breaking mechanism is dominated by gauge mediation.
Descripción18 pages, 3 figures.
URIhttp://hdl.handle.net/10261/20249
DOI10.1088/1126-6708/2009/11/113
ISSN1029-8479 (Online)
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