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Revisiting cosmological bounds on sterile neutrinos

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Revisiting cosmological bounds on sterile neutrinos

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dc.contributor.author	Vincent, Aaron C.
dc.contributor.author	Fernández Martínez, Enrique
dc.contributor.author	Hernández Gamazo, Pilar
dc.contributor.author	Mena Requejo, Olga
dc.contributor.author	Lattanzi, Massimiliano
dc.date.accessioned	2016-11-18T10:55:26Z
dc.date.available	2016-11-18T10:55:26Z
dc.date.issued	2015
dc.identifier.citation	Vincent, Aaron C. Fernández Martínez, Enrique Hernández Gamazo, Pilar Mena Requejo, Olga Lattanzi, Massimiliano 2015 Revisiting cosmological bounds on sterile neutrinos Journal Of Cosmology And Astroparticle Physics 04 4 006
dc.identifier.uri	http://hdl.handle.net/10550/56110
dc.description.abstract	We employ state-of-the art cosmological observables including supernova surveys and BAO information to provide constraints on the mass and mixing angle of a non-resonantly produced sterile neutrino species, showing that cosmology can effectively rule out sterile neutrinos which decay between BBN and the present day. The decoupling of an additional heavy neutrino species can modify the time dependence of the Universe's expansion between BBN and recombination and, in extreme cases, lead to an additional matter-dominated period; while this could naively lead to a younger Universe with a larger Hubble parameter, it could later be compensated by the extra radiation expected in the form of neutrinos from sterile decay. However, recombination-era observables including the Cosmic Microwave Background (CMB), the shift parameter R-CMB and the sound horizon r(s) from Baryon Acoustic Oscillations (BAO) severely constrain this scenario. We self-consistently include the full time-evolution of the coupled sterile neutrino and standard model sectors in an MCMC, showing that if decay occurs after BBN, the sterile neutrino is essentially bounded by the constraint sin(2) theta less than or similar to 0.026(m(s)/eV)(-2).
dc.language.iso	eng
dc.relation.ispartof	Journal Of Cosmology And Astroparticle Physics, 2015, vol. 04, num. 4, p. 006
dc.subject	Física
dc.title	Revisiting cosmological bounds on sterile neutrinos
dc.type	journal article	es_ES
dc.date.updated	2016-11-18T10:55:27Z
dc.identifier.doi	10.1088/1475-7516/2015/04/006
dc.identifier.idgrec	108162
dc.rights.accessRights	open access	es_ES