Constraints on massive neutrinos in a non-standard PPS scenario
Résumé
In this work we present cosmological bounds on three active neutrino masses and on steriles neutrino species in an extended cosmological scenario in which the primordial power spectrum of scalar perturbations differs from the usual power-law shape predicted by the simplest inflationary models. The power spectrum is instead modeled by means of a piecewise cubic Hermite interpolating polynomial (PCHIP). Our analyses consider different cosmological data sets combined with the new full Planck mission data, which include polarization measurements. When using Cosmic Microwave Background (CMB) measurements the constraints on massive neutrinos are degrades, while the addition of a prior on the Hubble constant and of the Barion Acoustic Oscillation (BAO) data displace the bound to lower values in agreement with the standard power-law PPS case. Moreover there is no preference fore a non-zero active and sterile neutrino masses if a scenario with ΔNeff massive steriles neutrino species is also considered.
Mots clés
neutrino: massive
neutrino: sterile
neutrino: mass
neutrino: sterile: mass
power spectrum: primordial
power spectrum: scalar
oscillation: acoustic
perturbation: scalar
inflation: model
cosmic background radiation: power spectrum
cosmological model
Hubble constant
cosmic background radiation: polarization
satellite: Planck
Cosmology
neutrinos
power spectrum