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Title: (Lack of) Cosmological evidence for dark radiation after Planck
Author: Verde, Licia
Feeney, Stephen M.
Mortlock, D. J.
Peiris, Hiranya V.
Keywords: Neutrins
Estadística bayesiana
Matèria fosca (Astronomia)
Bayesian statistical decision
Dark matter (Astronomy)
Issue Date: Sep-2013
Publisher: Institute of Physics (IOP)
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 (ΛCDM) 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.
Note: Versió postprint del document publicat a:
It is part of: Journal of Cosmology and Astroparticle Physics, 2013, vol. 2013, num. 037
ISSN: 1475-7516
Appears in Collections:Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
Publicacions de projectes de recerca finançats per la UE

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