Relic neutrinos, thermal axions, and cosmology in early 2014
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Relic neutrinos, thermal axions, and cosmology in early 2014

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Relic neutrinos, thermal axions, and cosmology in early 2014

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dc.contributor.author Giusarma, Elena
dc.contributor.author Di Valentino, Eleonora
dc.contributor.author Lattanzi, Massimiliano
dc.contributor.author Melchiorri, Alessandro
dc.contributor.author Mena Requejo, Olga
dc.date.accessioned 2015-04-20T10:43:06Z
dc.date.available 2015-04-20T10:43:06Z
dc.date.issued 2014
dc.identifier.uri http://hdl.handle.net/10550/43237
dc.description.abstract We present up-to-date cosmological bounds on the sum of active neutrino masses as well as on extended cosmological scenarios with additional thermal relics, as thermal axions or sterile neutrino species. Our analyses consider all the current available cosmological data in the beginning of year 2014, including the very recent and most precise baryon acoustic oscillation measurements from the Baryon Oscillation Spectroscopic Survey. In the minimal three-active-neutrino scenario, we find Sigma m(nu) < 0.22 eV at 95% C.L. from the combination of cosmic microwave background (CMB), baryon acoustic oscillation, and Hubble Space Telescope measurements of the Hubble constant. A nonzero value for the sum of the three active neutrino masses of similar to 0.3 eV is significantly favored at more than three standard deviations when adding the constraints on s 8 and Om from the Planck cluster catalog on galaxy number counts. This preference for nonzero thermal relic masses disappears almost completely in both the thermal axion and massive sterile neutrino schemes. Extra light species contribute to the effective number of relativistic degrees of freedom, parametrized via N-eff. We found that when the recent detection of B mode polarization from the BICEP2 experiment is considered, an analysis of the combined CMB data in the framework of LCDM + r models gives N-eff = 3.90 +/- 0.42, suggesting the presence of an extra relativistic relic at more than 95% C.L. from CMB-only data.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2014, vol. 90, num. 4, p. 043507
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Giusarma, Elena Di Valentino, Eleonora Lattanzi, Massimiliano Melchiorri, Alessandro Mena Requejo, Olga 2014 Relic neutrinos, thermal axions, and cosmology in early 2014 Physical Review D 90 4 043507
dc.subject Física
dc.subject Astronomia
dc.title Relic neutrinos, thermal axions, and cosmology in early 2014
dc.type info:eu-repo/semantics/article
dc.date.updated 2015-04-20T10:43:07Z
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevD.90.043507
dc.identifier.idgrec 102130

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