Abstract
We refer [1] to the role of an additional O(1) eV sterile neutrino in modified gravity models. We find parameter constraints in particular f(R) gravity model using following up-to-dated cosmological data: measurements of the cosmic microwave background (CMB) anisotropy, the CMB lensing potential, the baryon acoustic oscillations (BAO), the cluster mass function and the Hubble constant. It was obtained for the sterile neutrino mass 0.47 eV < m ν,sterile < 1 eV (2σ) assuming that the sterile neutrinos are thermalized and the active neutrinos are massless, not significantly larger than in the standard cosmology model within the same data set: 0.45 eV < m ν,sterile < 0.92 eV (2σ). But, if the mass of sterile neutrino is fixed and equals ≈ 1.5 eV according to various anomalies in neutrino oscillation experiments, f(R) gravity is much more consistent with observation data than the CDM model.
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Talk at The International Workshop on Prospects of Particle Physics: “Neutrino Physics and Astrophysics” February 1–8, 2015, Valday, Russia.
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Chudaykin, A.C. O(1) eV sterile neutrino in f(R) gravity. Phys. Part. Nuclei 48, 55–58 (2017). https://doi.org/10.1134/S1063779616060071
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DOI: https://doi.org/10.1134/S1063779616060071