title: Cosmology based on f(R) gravity admits 1 eV sterile neutrinos.
abstract: It is shown that the tension between recent neutrino oscillation experiments, favoring sterile neutrinos with masses of the order of 1 eV, and cosmological data which impose stringent constraints on neutrino masses from the free streaming suppression of density fluctuations, can be resolved in models of the present accelerated expansion of the Universe based on f(R) gravity.
authors.affiliation: Department of Physics, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan and Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan.
authors.forename: Hayato
authors.initials: H
authors.lastname: Motohashi
authors.affiliation: Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan and L. D. Landau Institute for Theoretical Physics RAS, Moscow 119334, Russia.
authors.forename: Alexei A
authors.initials: AA
authors.lastname: Starobinsky
authors.affiliation: Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan and Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), The University of Tokyo, Kashiwa, Chiba 277-8568, Japan.
authors.forename: Jun'ichi
authors.initials: J
authors.lastname: Yokoyama