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2013-09

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/110169

(Lack of) Cosmological evidence for dark radiation after Planck

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https://doi.org/10.1088/1475-7516/2013/09/013

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.

Subject

Neutrins, Estadística bayesiana, Matèria fosca (Astronomia), Cosmologia

Subject (English)

Neutrinos, Bayesian statistical decision, Dark matter (Astronomy), Cosmology

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Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
Publicacions de projectes de recerca finançats per la UE

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VERDE, Licia, et al. (Lack of) Cosmological evidence for dark radiation after Planck. Journal of Cosmology and Astroparticle Physics. 2013. Vol. 2013, num. 037. ISSN 1475-7516. [consulted: 14 of August of 2026]. Available at: https://hdl.handle.net/2445/110169

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