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Testing standard and nonstandard neutrino physics with cosmological data

Giusarma, Elena and de Putter, Roland and Mena, Olga (2013) Testing standard and nonstandard neutrino physics with cosmological data. Physical Review D, 87 (4). Art. No. 043515 . ISSN 2470-0010.

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Cosmological constraints on the sum of neutrino masses and on the effective number of neutrino species in standard and nonstandard scenarios are computed using the most recent available cosmological data. Our cosmological data sets include the measurement of the baryonic acoustic oscillation (BAO) feature in the data release 9 CMASS sample of the baryon oscillation spectroscopic survey. We study in detail the different degeneracies among the parameters, as well as the impact of the different data sets used in the analyses. When considering bounds on the sum of the three active neutrino masses, the information in the BAO signal from galaxy clustering measurements is approximately equally powerful as the shape information from the matter power spectrum. The most stringent bound we find is ∑m_ν<0.32  eV at 95% C.L. When nonstandard neutrino scenarios with Neff massless or massive neutrino species are examined, power spectrum shape measurements provide slightly better bounds than the BAO signal only, due to the breaking of parameter degeneracies. Cosmic microwave background data from high multipoles from the South Pole Telescope turns out to be crucial for extracting the number of effective neutrino species. Recent baryon oscillation spectroscopic survey data combined with cosmic microwave background and Hubble Space Telescope measurements give N_eff=3.66^(+0.20+0.73)_(-0.21-0.69) in the massless neutrino scenario, and similar results are obtained in the massive case. The evidence for extra radiation N_eff>3 often claimed in the literature therefore remains at the 2σ level when considering up-to-date cosmological data sets. Measurements from the Wilkinson Microwave Anisotropy Probe combined with a prior on the Hubble parameter from the Hubble Space Telescope are very powerful in constraining either the sum of the three active neutrino masses or the number of massless neutrino species. If the former two parameters are allowed to freely vary, however, the bounds from the combination of these two cosmological probes get worse by an order of magnitude.

Item Type:Article
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URLURL TypeDescription Paper
Alternate Title:Testing standard and non-standard neutrino physics with cosmological data
Additional Information:© 2013 American Physical Society. Received 26 November 2012; published 7 February 2013. We gratefully acknowledge Antonio Cuesta for providing the modified version of COSMOMC with the recent BAO measurements included. We also thank Signe Riemer- Sørensen and Chris Blake for their help with the cross comparison of results. O. M. is supported by the Consolider Ingenio Project No. CSD2007-00060, by PROMETEO/2009/116, by the Spanish Ministry Science Project No. FPA2011-29678 and by the ITN Invisibles PITN-GA-2011-289442. Part of the research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
Funding AgencyGrant Number
Consolider Ingenio ProjectCSD2007-00060
Ministerio de Educación y Ciencia (MEC)FPA2011-29678
Marie Curie FellowshipPITN-GA-2011-289442
Issue or Number:4
Classification Code:PACS: 98.80.-k, 95.85.Sz, 98.70.Vc, 98.80.Cq
Record Number:CaltechAUTHORS:20130116-104024183
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36425
Deposited By: JoAnn Boyd
Deposited On:30 Jan 2013 19:08
Last Modified:03 Oct 2019 04:38

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