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Constraints on massive sterile neutrino species from current and future cosmological data

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Constraints on massive sterile neutrino species from current and future cosmological data

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dc.contributor.author	Giusarma, Elena
dc.contributor.author	Corsi, Martina
dc.contributor.author	Archidiacono, Maria
dc.contributor.author	de Putter, Roland
dc.contributor.author	Melchiorri, Alessandro
dc.contributor.author	Mena Requejo, Olga
dc.contributor.author	Pandolfi, Stefania
dc.date.accessioned	2014-09-16T07:18:32Z
dc.date.available	2014-09-16T07:18:32Z
dc.date.issued	2011
dc.identifier.citation	Giusarma, Elena Corsi, Martina Archidiacono, Maria de Putter, Roland Melchiorri, Alessandro Mena Requejo, Olga Pandolfi, Stefania 2011 Constraints on massive sterile neutrino species from current and future cosmological data Physical Review D 83 11 115023
dc.identifier.uri	http://hdl.handle.net/10550/37913
dc.description.abstract	Sterile massive neutrinos are a natural extension of the standard model of elementary particles. The energy density of the extra sterile massive states affects cosmological measurements in an analogous way to that of active neutrino species. We perform here an analysis of current cosmological data and derive bounds on the masses of the active and the sterile neutrino states, as well as on the number of sterile states. The so-called (3 + 2) models, with three sub-eV active massive neutrinos plus two sub-eV massive sterile species, is well within the 95% CL allowed regions when considering cosmological data only. If the two extra sterile states have thermal abundances at decoupling, big bang nucleosynthesis bounds compromise the viability of (3 + 2) models. Forecasts from future cosmological data on the active and sterile neutrino parameters are also presented. Independent measurements of the neutrino mass from tritium beta-decay experiments and of the Hubble constant could shed light on sub-eV massive sterile neutrino scenarios.
dc.language.iso	eng
dc.relation.ispartof	Physical Review D, 2011, vol. 83, num. 11, p. 115023
dc.subject	Física
dc.title	Constraints on massive sterile neutrino species from current and future cosmological data
dc.type	journal article	es_ES
dc.date.updated	2014-09-16T07:18:32Z
dc.identifier.doi	10.1103/PhysRevD.83.115023
dc.identifier.idgrec	069226
dc.rights.accessRights	open access	es_ES