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$\nu\Lambda$CDM: Neutrinos help reconcile Planck with the Local Universe by Wyman, Mark; Rudd, Douglas H.; Vanderveld, R. Ali; Hu, Wayne is a scholarly article available to read on EtoBox.

What is $\nu\Lambda$CDM: Neutrinos help reconcile Planck with the Local Universe about?

Current measurements of the low and high redshift Universe are in tension if we restrict ourselves to the standard six parameter model of flat $\Lambda$CDM. This tension has two parts. First, the Planck satellite data suggest a higher normalization of matter perturbations than local measurements of galaxy clusters. Second, the expansion rate of the Universe today, $H_0$, derived from local distance-redshift measurements is significantly higher than that inferred using the acoustic scale in galaxy surveys and the Planck data as a standard ruler. The addition of a sterile neutrino species changes the acoustic scale and brings the two into agreement; meanwhile, adding mass to the active neutrinos or to a sterile neutrino can suppress the growth of structure, bringing the cluster data into better concordance as well. For our fiducial dataset combination, with statistical errors for clusters, a model with a massive sterile neutrino shows 3.5$\sigma$ evidence for a non-zero mass and an even stronger rejection of the minimal model. A model with massive active neutrinos and a massless sterile neutrino is similarly preferred. An eV-scale sterile neutrino mass -- of interest for short baseli

Author

Wyman, Mark; Rudd, Douglas H.; Vanderveld, R. Ali; Hu, Wayne

Published

2013

Language

EN