Gravitational Interactions and Neutrino Masses
arXiv:2003.04908 · doi:10.1103/PhysRevD.101.115024
Abstract
We describe a scenario where the smallness of neutrino masses is related to a global symmetry that is only violated by quantum gravitational effects. The coupling of neutrinos to gauge singlet right-handed fermions is attributed to symmetry preserving gravitational operators suppressed by the Planck mass, in this framework. The proposed scenario leads to axion particles that decay into neutrinos, which could be probed through cosmological measurements and may help explain the Hubble parameter tension. Depending on the details of the implementation, the scenario could provide axion dark matter candidates.
arXiv comment7 pages, 3 figures. This version, accepted for publication in Physical Review D, includes clarifying comments regarding Eq.(14), which has been made more accurate; typo in Eq.(23) corrected. Numerical results and figures have been updated to reflect changes
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