Is an 11 eV sterile neutrino consistent with clusters, the cosmic microwave background and modified Newtonian dynamics?

Journal article

Authors / Editors

Angus, Garry

Research Areas

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Publication Details

Author list: Angus GW

Publisher: Oxford University Press

Place: OXFORD

Publication year: 2009

Journal: Monthly Notices of the Royal Astronomical Society (0035-8711)

Journal acronym: MON NOT R ASTRON SOC

Volume number: 394

Issue number: 1

Start page: 527

End page: 532

Number of pages: 6

ISSN: 0035-8711

eISSN: 1365-2966

Languages: English-Great Britain (EN-GB)

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Abstract

In this paper, we show that if a single sterile neutrino exists such that m(upsilon s) similar to 11 eV, it can serendipitously solve all outstanding issues of the Modified Newtonian Dynamics. We focus on fitting the angular power spectrum of the cosmic microwave background ( CMB) in detail which is possible using a flat Universe with Omega(upsilon s) similar to 0.23 and the usual baryonic and dark energy components. One cannot match the CMB if there is more than one massive sterile neutrino, nor with three active neutrinos of 2 eV. This model has the same expansion history as the Lambda cold dark matter (Lambda CDM) model and only differs at the galactic scale, where the modified dynamics outperform Lambda CDM comprehensively. We discuss how an 11 eV sterile neutrino can explain the dark matter of galaxy clusters without influencing individual galaxies and potentially match the matter power spectrum.

Keywords

cosmic microwave background, gravitation, neutrinos

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