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Sterile neutrinos in light of recent cosmological and oscillation data: a multi-flavor scheme approach

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Sterile neutrinos in light of recent cosmological and oscillation data: a multi-flavor scheme approach

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dc.contributor.author	Melchiorri, Alessandro
dc.contributor.author	Mena Requejo, Olga
dc.contributor.author	Palomares Ruiz, Sergio
dc.contributor.author	Pascoli, Silvia
dc.contributor.author	Slosar, Anze
dc.contributor.author	Sorel, Michel
dc.date.accessioned	2014-09-11T08:34:32Z
dc.date.available	2014-09-11T08:34:32Z
dc.date.issued	2009
dc.identifier.citation	Melchiorri, Alessandro Mena Requejo, Olga Palomares Ruiz, Sergio Pascoli, Silvia Slosar, Anze Sorel, Michel 2009 Sterile neutrinos in light of recent cosmological and oscillation data: a multi-flavor scheme approach Journal Of Cosmology And Astroparticle Physics 2009 1 036
dc.identifier.uri	http://hdl.handle.net/10550/37737
dc.description.abstract	Light sterile neutrinos might mix with the active ones and be copiously produced in the early Universe. In the present paper, a detailed multi-flavor analysis of sterile neutrino production is performed. Making some justified approximations allows us to consider not only neutrino interactions with the primeval medium and neutrino coherence breaking effects, but also oscillation effects arising from the presence of three light (mostly-active) neutrino states mixed with two heavier (mostly-sterile) states. First, we emphasize the underlying physics via an analytical description of sterile neutrino abundances that is valid for cases with small mixing between active and sterile neutrinos. Then, we study in detail the phenomenology of (3+2) sterile neutrino models in light of short-baseline oscillation data, including the LSND and MiniBooNE results. Finally, by using the information provided by this analysis, we obtain the expected sterile neutrino cosmological abundances and then contrast them with the most recet available data from Cosmic Microwave Background and Large Scale Structure observations. We conclude that (3+2) models are significantly more disfavored by the internal inconsistencies between sterile neutrino interpretations of appearance and disappearance short-baseline data themselves, rather than by the used cosmological data.
dc.language.iso	eng
dc.relation.ispartof	Journal Of Cosmology And Astroparticle Physics, 2009, vol. 2009, num. 1, p. 036
dc.subject	Astrofísica
dc.title	Sterile neutrinos in light of recent cosmological and oscillation data: a multi-flavor scheme approach
dc.type	journal article	es_ES
dc.date.updated	2014-09-11T08:34:32Z
dc.identifier.doi	10.1088/1475-7516/2009/01/036
dc.identifier.idgrec	097547
dc.rights.accessRights	open access	es_ES