Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-08-04
JHEP 0810:080,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
26 pages, 4 eps figures, version published in JHEP
Scientific paper
10.1088/1126-6708/2008/10/080
We compute the relic abundance of the right-handed sneutrinos in the supersymmetric F_D-term model of hybrid inflation. As well as providing a natural solution to the mu- and gravitino overabundance problems, the F_D-term model offers a new viable candidate to account for the cold dark matter in the Universe: the lightest right-handed sneutrino. In particular, the F_D-term model predicts a new quartic coupling of purely right-handed sneutrinos to the Higgs doublets that thermalizes the sneutrinos and makes them annihilate sufficiently fast to a level compatible with the current cosmic microwave background data. We analyze this scenario in detail and identify favourable regions of the parameter space within the framework of minimal supergravity, for which the lightest right-handed sneutrino becomes the thermal dark matter, in agreement with WMAP observations of cosmological inflation. Constraints derived from direct dark matter searches experiments are presented.
Deppisch Frank F.
Pilaftsis Apostolos
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