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Title: Is there evidence for additional neutrino species from cosmology?
Author: Feeney, Stephen M.
Peiris, Hiranya V.
Verde, Licia
Keywords: Estadística bayesiana
Model estàndard (Física nuclear)
Bayesian statistical decision
Standard model (Nuclear physics)
Issue Date: Apr-2013
Publisher: Institute of Physics (IOP)
Abstract: It has been suggested that recent cosmological and flavor-oscillation data favor the existence of additional neutrino species beyond the three predicted by the Standard Model of particle physics. We apply Bayesian model selection to determine whether there is indeed any evidence from current cosmological datasets for the standard cosmological model to be extended to include additional neutrino flavors. The datasets employed include cosmic microwave background temperature, polarization and lensing power spectra, and measurements of the baryon acoustic oscillation scale and the Hubble constant. We also consider other extensions to the standard neutrino model, such as massive neutrinos, and possible degeneracies with other cosmological parameters. The Bayesian evidence indicates that current cosmological data do not require any non-standard neutrino properties.
Note: Versió postprint del document publicat a:
It is part of: Journal of Cosmology and Astroparticle Physics, 2013, vol. 2013, num. 036
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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