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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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.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.rights.uri info:eu-repo/semantics/openAccess
dc.source 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.subject Astrofísica
dc.title Sterile neutrinos in light of recent cosmological and oscillation data: a multi-flavor scheme approach
dc.type info:eu-repo/semantics/article
dc.date.updated 2014-09-11T08:34:32Z
dc.identifier.doi http://dx.doi.org/10.1088/1475-7516/2009/01/036
dc.identifier.idgrec 097547

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