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Relic Neutrino Decoupling Including Flavour Oscillations

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Relic Neutrino Decoupling Including Flavour Oscillations

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dc.contributor.author	Mangano, Gianpiero
dc.contributor.author	Miele, Gennaro
dc.contributor.author	Pastor Carpi, Sergio
dc.contributor.author	Pinto, Teguayco
dc.contributor.author	Pisanti, Ofelia
dc.contributor.author	Serpico, Pasquale D.
dc.date.accessioned	2014-07-31T12:18:41Z
dc.date.available	2014-07-31T12:18:41Z
dc.date.issued	2005
dc.identifier.citation	Mangano, Gianpiero Miele, Gennaro Pastor Carpi, Sergio Pinto, Teguayco Pisanti, Ofelia Serpico, Pasquale D. 2005 Relic Neutrino Decoupling Including Flavour Oscillations Nuclear Physics B 729 221 234
dc.identifier.uri	http://hdl.handle.net/10550/37350
dc.description.abstract	In the early universe, neutrinos are slightly coupled when electron-positron pairs annihilate transferring their entropy to photons. This process originates non-thermal distortions on the neutrino spectra which depend on neutrino flavour, larger for nu_e than for nu_mu or nu_tau. We study the effect of three-neutrino flavour oscillations on the process of neutrino decoupling by solving the momentum-dependent kinetic equations for the neutrino spectra. We find that oscillations do not essentially modify the total change in the neutrino energy density, giving Neff=3.046 in terms of the effective number of neutrinos, while the small effect over the production of primordial 4He is increased by O(20%), up to 2.1 x 10^{-4}. These results are stable within the presently favoured region of neutrino mixing parameters.
dc.language.iso	eng
dc.relation.ispartof	Nuclear Physics B, 2005, vol. 729, p. 221-234
dc.subject	Física
dc.title	Relic Neutrino Decoupling Including Flavour Oscillations
dc.type	journal article	es_ES
dc.date.updated	2014-07-31T12:18:41Z
dc.identifier.doi	10.1016/j.nuclphysb.2005.09.041
dc.identifier.idgrec	025742
dc.rights.accessRights	open access	es_ES