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Neutrino and dark radiation properties in light of recent CMB observations

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Neutrino and dark radiation properties in light of recent CMB observations

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dc.contributor.author	Archidiacono, Maria
dc.contributor.author	Giusarma, Elena
dc.contributor.author	Melchiorri, Alessandro
dc.contributor.author	Mena Requejo, Olga
dc.date.accessioned	2013-11-26T11:41:31Z
dc.date.available	2013-11-26T11:41:31Z
dc.date.issued	2013
dc.identifier.citation	Archidiacono, M. Giusarma, Elena Melchiorri, A. Mena Requejo, Olga 2013 Neutrino and dark radiation properties in light of recent CMB observations Physical Review D 87 10 103519
dc.identifier.uri	http://hdl.handle.net/10550/31428
dc.description.abstract	Recent cosmic microwave background measurements at high multipoles from the South Pole Telescope and from the Atacama Cosmology Telescope seem to disagree in their conclusions for the neutrino and dark radiation properties. In this paper we set new bounds on the dark radiation and neutrino properties in different cosmological scenarios combining the ACT and SPT data with the nine-year data release of the Wilkinson Microwave Anisotropy Probe (WMAP-9), baryon acoustic oscillation data, Hubble Telescope measurements of the Hubble constant, and supernovae Ia luminosity distance data. In the standard three massive neutrino case, the two high multipole probes give similar results if baryon acoustic oscillation data are removed from the analyses and Hubble Telescope measurements are also exploited. A similar result is obtained within a standard cosmology with N-eff massless neutrinos, although in this case the agreement between these two measurements is also improved when considering simultaneously baryon acoustic oscillation data and Hubble Space Telescope measurements. In the N-eff massive neutrino case the two high multipole probes give very different results regardless of the external data sets used in the combined analyses. When considering extended cosmological scenarios with a dark energy equation of state or with a running of the scalar spectral index, the evidence for neutrino masses found for the South Pole Telescope in the three neutrino scenario disappears for all the data combinations explored here. Again, adding Hubble Telescope data seems to improve the agreement between the two high multipole cosmic microwave background measurements considered here. In the case in which a dark radiation background with unknown clustering properties is also considered, SPT data seem to exclude the standard value for the dark radiation viscosity c(vis)(2) = 1/3 at the 2 sigma C.L., finding evidence for massive neutrinos only when combining SPT data with baryon acoustic oscillation measurements.
dc.relation.ispartof	Physical Review D, 2013, vol. 87, num. 10, p. 103519
dc.subject	Cosmologia
dc.subject	Radiació
dc.title	Neutrino and dark radiation properties in light of recent CMB observations
dc.type	journal article	es_ES
dc.date.updated	2013-11-26T11:41:31Z
dc.identifier.doi	10.1103/PhysRevD.87.103519
dc.identifier.idgrec	092070
dc.rights.accessRights	open access	es_ES
dc.identifier.url	10.1103/PhysRevD.87.103519