CERN Accelerating science

Article
Report number arXiv:1307.2904
Title (Lack of) Cosmological evidence for dark radiation after Planck
Author(s) Verde, Licia (ICREA, Barcelona ; CERN ; ICC, Barcelona U.) ; Feeney, Stephen M. (University Coll. London) ; Mortlock, Daniel J. (Imperial Coll., London) ; Peiris, Hiranya V. (University Coll. London ; Santa Barbara, KITP)
Publication 2013-09-10
Imprint 10 Jul 2013
Number of pages 17
Note Comments: 16 pages, 2 figures
16 pages, 2 figures, small changes to match journal accepted version
In: JCAP 09 (2013) 013
DOI 10.1088/1475-7516/2013/09/013
Subject category Astrophysics and Astronomy
Abstract We use Bayesian model comparison to determine whether extensions to Standard-Model neutrino physics -- primarily additional effective numbers of neutrinos and/or massive neutrinos -- are merited by the latest cosmological data. Given the significant advances in cosmic microwave background (CMB) observations represented by the Planck data, we examine whether Planck temperature and CMB lensing data, in combination with lower redshift data, have strengthened (or weakened) the previous findings. We conclude that the state-of-the-art cosmological data do not show evidence for deviations from the standard cosmological model (which has three massless neutrino families). This does not mean that the model is necessarily correct -- in fact we know it is incomplete as neutrinos are not massless -- but it does imply that deviations from the standard model (e.g., non-zero neutrino mass) are too small compared to the current experimental uncertainties to be inferred from cosmological data alone.
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 记录创建於2013-07-12,最後更新在2023-12-13


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