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      Hints of Sterile Neutrinos in Recent Measurements of the Hubble Parameter

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          Abstract

          Local Universe observations find a value of the Hubble constant H0 that is larger than the value inferred from the Cosmic Microwave Background and other early Universe measurements, assuming known physics and the ΛCDM cosmological model. We show that additional radiation in active neutrinos produced just before Big Bang Nucleosynthesis by an unstable sterile neutrino with mass ms= O(10) MeV can alleviate this discrepancy. The necessary masses and couplings of the sterile neutrino, assuming it mixes primarily with ντ and/or νμ neutrinos, are within reach of Super-Kamiokande as well as upcoming laboratory experiments such as NA62.

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          Author and article information

          Journal
          24 June 2019
          Article
          1906.10136
          4a23cdbd-69f9-472a-aa9f-65a4884e25ea

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          IPMU19-0090
          5 pages, 1 figure
          astro-ph.CO hep-ph

          Cosmology & Extragalactic astrophysics,High energy & Particle physics
          Cosmology & Extragalactic astrophysics, High energy & Particle physics

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