Neutrinos help reconcile Planck measurements with both the early and local Universe

Cora Dvorkin, Mark Wyman, Douglas H. Rudd, and Wayne Hu
Phys. Rev. D 90, 083503 – Published 2 October 2014

Abstract

In light of the recent BICEP2 B-mode polarization detection, which implies a large inflationary tensor-to-scalar ratio r0.05=0.20.05+0.07, we re-examine the evidence for an extra sterile massive neutrino, originally invoked to account for the tension between the cosmic microwave background (CMB) temperature power spectrum and local measurements of the expansion rate H0 and cosmological structure. With only the standard active neutrinos and power-law scalar spectra, this detection is in tension with the upper limit of r<0.11 (95% confidence) from the lack of a corresponding low multipole excess in the temperature anisotropy from gravitational waves. An extra sterile species with the same energy density as is needed to reconcile the CMB data with H0 measurements can also alleviate this new tension. By combining data from the Planck and ACT/SPT temperature spectra, WMAP9 polarization, H0, baryon acoustic oscillation and local cluster abundance measurements with BICEP2 data, we find the joint evidence for a sterile massive neutrino increases to ΔNeff=0.98±0.26 for the effective number and ms=0.52±0.13eV for the effective mass, or 3.8σ and 4σ evidence, respectively. We caution the reader that these results correspond to a joint statistical evidence and, in addition, astrophysical systematic errors in the clusters and H0 measurements, and small-scale CMB data could weaken our conclusions.

    • Received 31 March 2014

    DOI:https://doi.org/10.1103/PhysRevD.90.083503

    © 2014 American Physical Society

    Authors & Affiliations

    Cora Dvorkin*

    • Institute for Advanced Study, School of Natural Sciences, Einstein Drive, Princeton, New Jersey 08540, USA

    Mark Wyman

    • New York University, Center for Cosmology and Particle Physics, New York, New York 10003, USA

    Douglas H. Rudd

    • Kavli Institute for Cosmological Physics, Research Computing Center, University of Chicago, Chicago, Illinois 60637, USA

    Wayne Hu

    • Kavli Institute for Cosmological Physics, Department of Astronomy and Astrophysics, Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA

    • *cdvorkin@ias.edu

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    Issue

    Vol. 90, Iss. 8 — 15 October 2014

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