Possible hints of sterile neutrinos in recent measurements of the Hubble parameter
Graciela B. Gelmini, Alexander Kusenko, Volodymyr Takhistov
Abstract
Abstract 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 ΛCDM 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 ν τ and/or ν μ neutrinos, are within reach of Super-Kamiokande as well as upcoming laboratory experiments such as NA62 and DUNE.
Topics & Concepts
PhysicsHubble's lawCosmic microwave backgroundSterile neutrinoBig Bang nucleosynthesisCosmic neutrino backgroundNeutrinoCosmic background radiationAstrophysicsAge of the universeCosmologyUniverseNucleosynthesisBig Bang (financial markets)Background radiationParticle physicsDark radiationAstronomyCOSMIC cancer databaseCosmological constantHubble volumeSolar neutrinoUltimate fate of the universeMetric expansion of spacePhysics beyond the Standard ModelCosmic rayNeutrino oscillationSolar neutrino problemCosmology and Gravitation TheoriesNeutrino Physics ResearchParticle physics theoretical and experimental studies