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Effects of non-standard neutrino-electron interactions on relic neutrino decoupling

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Effects of non-standard neutrino-electron interactions on relic neutrino decoupling

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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	2014-07-31T13:05:56Z
dc.date.available	2014-07-31T13:05:56Z
dc.date.issued	2006
dc.identifier.citation	Mangano, Gianpiero Miele, Gennaro Pastor Carpi, Sergio Pinto, Teguayco Pisanti, Ofelia Serpico, Pasquale D. 2006 Effects of non-standard neutrino-electron interactions on relic neutrino decoupling Nuclear Physics B 756 1-2 100 116
dc.identifier.uri	http://hdl.handle.net/10550/37353
dc.description.abstract	We consider the decoupling of neutrinos in the early Universe in presence of non-standard neutral current neutrino-electron interactions (NSI). We first discuss a semi-analytical approach to solve the relevant kinetic equations and then present the results of fully numerical and momentum-dependent calculations, including flavor neutrino oscillations. We present our results in terms of both the effective number of neutrino species (Neff) and the impact on the abundance of He-4 produced during Big Bang Nucleosynthesis. We find that, for NSI parameters within the ranges allowed by present laboratory data, non-standard neutrino-electron interactions do not essentially modify the density of relic neutrinos nor the bounds on neutrino properties from cosmological observables, such as their mass. Nonetheless, the presence of neutrino-electron NSI may enhance the entropy transfer from electron-positron pairs into neutrinos instead of photons, up to a value of Neff=3.12. This is almost three times the correction to Neff=3 that appears for standard weak interactions.
dc.language.iso	eng
dc.relation.ispartof	Nuclear Physics B, 2006, vol. 756, num. 1-2, p. 100-116
dc.title	Effects of non-standard neutrino-electron interactions on relic neutrino decoupling
dc.type	journal article	es_ES
dc.date.updated	2014-07-31T13:05:56Z
dc.identifier.doi	10.1016/j.nuclphysb.2006.09.002
dc.identifier.idgrec	037158
dc.rights.accessRights	open access	es_ES