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- W2091330782 abstract "The recent cosmic microwave background data from the Planck satellite experiment, when combined with Hubble Space Telescope determinations of the Hubble constant, are compatible with a larger, nonstandard number of relativistic degrees of freedom at recombination, parametrized by the neutrino effective number ${N}_{text{eff}}$. In the curvaton scenario, a larger value for ${N}_{text{eff}}$ could arise from a nonzero neutrino chemical potential connected to residual neutrino isocurvature density (NID) perturbations after the decay of the curvaton field, the component of which is parametrized by the amplitude ${ensuremath{alpha}}^{mathrm{NID}}$. Here we present new constraints on ${N}_{text{eff}}$ and ${ensuremath{alpha}}^{mathrm{NID}}$ from an analysis of recent cosmological data. We find that the $text{Planck}+mathrm{WMAP}$ polarization data set does not show any indication of a NID component (severely constraining its amplitude), and that current indications for a nonstandard ${N}_{text{eff}}$ are further relaxed." @default.
- W2091330782 created "2016-06-24" @default.
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- W2091330782 date "2014-10-29" @default.
- W2091330782 modified "2023-09-28" @default.
- W2091330782 title "Planck constraints on neutrino isocurvature density perturbations" @default.
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- W2091330782 doi "https://doi.org/10.1103/physrevd.90.083531" @default.
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