Neutrino oscillations in the early Universe

We discuss the oscillations effects on neutrinos in the early Universe and update the cosmological constraints on the oscillation parameters. It is shown that sterile LOW solution to the solar neutrino problem is almost completely excluded from cosmological nucleosynthesis considerations. Two possib...

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Detalles Bibliográficos
Autores principales: Kirilova, D., Chizhov, M.
Lenguaje:eng
Publicado: 2001
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1016/S0920-5632(01)01473-6
http://cds.cern.ch/record/486811
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author Kirilova, D.
Chizhov, M.
author_facet Kirilova, D.
Chizhov, M.
author_sort Kirilova, D.
collection CERN
description We discuss the oscillations effects on neutrinos in the early Universe and update the cosmological constraints on the oscillation parameters. It is shown that sterile LOW solution to the solar neutrino problem is almost completely excluded from cosmological nucleosynthesis considerations. Two possibilities for the relaxation of this constraint are discussed: high primordial helium-4 yield and a relic lepton asymmetry present at nucleosynthesis epoch. The numerical analysis proved that Y_p=0.25 only relaxes the constraint on LOW solution, while L > 10^{-5} is capable to remove it.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2001
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spelling cern-4868112023-03-14T18:59:23Zdoi:10.1016/S0920-5632(01)01473-6http://cds.cern.ch/record/486811engKirilova, D.Chizhov, M.Neutrino oscillations in the early UniverseParticle Physics - PhenomenologyWe discuss the oscillations effects on neutrinos in the early Universe and update the cosmological constraints on the oscillation parameters. It is shown that sterile LOW solution to the solar neutrino problem is almost completely excluded from cosmological nucleosynthesis considerations. Two possibilities for the relaxation of this constraint are discussed: high primordial helium-4 yield and a relic lepton asymmetry present at nucleosynthesis epoch. The numerical analysis proved that Y_p=0.25 only relaxes the constraint on LOW solution, while L > 10^{-5} is capable to remove it.We discuss the oscillations effects on neutrinos in the early Universe and update the cosmological constraints on the oscillation parameters. It is shown that sterile LOW solution to the solar neutrino problem is almost completely excluded from cosmological nucleosynthesis considerations. Two possibilities for the relaxation of this constraint are discussed: high primordial helium-4 yield and a relic lepton asymmetry present at nucleosynthesis epoch. The numerical analysis proved that Y_p=0.25 only relaxes the constraint on LOW solution, while L > 10^{-5} is capable to remove it.hep-ph/0102114oai:cds.cern.ch:4868112001
spellingShingle Particle Physics - Phenomenology
Kirilova, D.
Chizhov, M.
Neutrino oscillations in the early Universe
title Neutrino oscillations in the early Universe
title_full Neutrino oscillations in the early Universe
title_fullStr Neutrino oscillations in the early Universe
title_full_unstemmed Neutrino oscillations in the early Universe
title_short Neutrino oscillations in the early Universe
title_sort neutrino oscillations in the early universe
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/S0920-5632(01)01473-6
http://cds.cern.ch/record/486811
work_keys_str_mv AT kirilovad neutrinooscillationsintheearlyuniverse
AT chizhovm neutrinooscillationsintheearlyuniverse

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