Solving cosmological problem in universal extra dimension models by introducing Dirac neutrino

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dc.creatorMatsumoto, Shigeki
dc.creatorSato, Joe
dc.creatorSenami, Masato
dc.creatorYamanaka, Masato
dc.date2006-07-29
dc.date2007-03-31
dc.date.accessioned2026-07-07T10:25:12Z
dc.date.available2026-07-07T10:25:12Z
dc.descriptionUniversal extra dimension (UED) models with right-handed neutrinos are studied. The introduction of the neutrinos makes us possible not only to describe Dirac neutrino masses but also to solve the cosmological problem called the KK graviton problem. This problem is essentially caused by the late time decay of a KK photon into a KK graviton and a photon, and it distorts the spectrum of the cosmic microwave background or the diffuse photon. We point out that, once we introduce right-handed neutrinos to UED models, the KK photon decays dominantly into neutrinos and does not emit a photon. We also discuss sub-dominant modes with a photon in the decay quantitatively, and show that their branching ratios are so small that the spectra are not distorted.
dc.descriptionSome discussions are added.
dc.identifierhttps://arxiv.org/abs/hep-ph/0607331
dc.identifierhttp://arxiv.org/abs/hep-ph/0607331
dc.identifierPhys.Lett.B647:466-471,2007
dc.identifierdoi:10.1016/j.physletb.2007.02.033
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176460
dc.subjectHigh Energy Physics - Phenomenology
dc.titleSolving cosmological problem in universal extra dimension models by introducing Dirac neutrino
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