Possible Hints of Sterile Neutrinos in Recent Measurements of the Hubble Parameter. (arXiv:1906.10136v3 [astro-ph.CO] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Gelmini_G/0/1/0/all/0/1">Graciela B. Gelmini</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kusenko_A/0/1/0/all/0/1">Alexander Kusenko</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Takhistov_V/0/1/0/all/0/1">Volodymyr Takhistov</a>
Local Universe observations find a value of the Hubble constant $H_0$ that is
larger than the value inferred from the Cosmic Microwave Background and other
early Universe measurements, assuming known physics and the $Lambda$CDM
cosmological model. We show that additional radiation in active neutrinos
produced just before Big Bang Nucleosynthesis by an unstable sterile neutrino
with mass $m_s=$ O(10) MeV can alleviate this discrepancy. The necessary masses
and couplings of the sterile neutrino, assuming it mixes primarily with
$nu_{tau}$ and/or $nu_{mu}$ neutrinos, are within reach of Super-Kamiokande
as well as upcoming laboratory experiments such as NA62 and DUNE.
Local Universe observations find a value of the Hubble constant $H_0$ that is
larger than the value inferred from the Cosmic Microwave Background and other
early Universe measurements, assuming known physics and the $Lambda$CDM
cosmological model. We show that additional radiation in active neutrinos
produced just before Big Bang Nucleosynthesis by an unstable sterile neutrino
with mass $m_s=$ O(10) MeV can alleviate this discrepancy. The necessary masses
and couplings of the sterile neutrino, assuming it mixes primarily with
$nu_{tau}$ and/or $nu_{mu}$ neutrinos, are within reach of Super-Kamiokande
as well as upcoming laboratory experiments such as NA62 and DUNE.
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