Gravitino Dark Matter with Weak-Scale Right-Handed Sneutrino

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dc.creatorIshiwata, Koji
dc.creatorMatsumoto, Shigeki
dc.creatorMoroi, Takeo
dc.date2007-10-16
dc.date2008-01-18
dc.date.accessioned2026-07-07T11:12:16Z
dc.date.available2026-07-07T11:12:16Z
dc.descriptionWe consider cosmological implications of supersymmetric models with right-handed (s)neutrinos where the neutrino masses are purely Dirac-type. We pay particular attention to the case where gravitino is the lightest superparticle while one of the right-handed sneutrinos is next-to-the-lightest superparticle. We study constraints from big-bang nuleosynthesis and show that the constraints could be relaxed compared to the case without right-handed sneutrinos. As a result, the gravitino-dark-matter scenario becomes viable with relatively large value of the gravitino mass. We also discuss constraints from the structure formation; in our model, the free-streaming length of the gravitino dark matter may be as long as O(1 Mpc), which is comparable to the present observational upper bound on the scale of free-streaming.
dc.description18 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/0710.2968
dc.identifierhttp://arxiv.org/abs/0710.2968
dc.identifierPhys.Rev.D77:035004,2008
dc.identifierdoi:10.1103/PhysRevD.77.035004
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/191323
dc.subjectHigh Energy Physics - Phenomenology
dc.titleGravitino Dark Matter with Weak-Scale Right-Handed Sneutrino
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