Neutrino masses from Planck-scale lepton number breaking

Abstract

We consider an extension of the Standard Model by right-handed neutrinos and we argue that, under plausible assumptions, a neutrino mass of $\mathcal{O}(0.1)\mathrm{eV}$ is naturally generated by the breaking of the lepton number at the Planck scale, possibly by gravitational effects, without the necessity of introducing new mass scales in the model. Some implications of this framework are also briefly discussed.

arXiv comment5 pages, 2 figures. Matches published version

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• Two-loop renormalization group equations for right-handed neutrino masses and phenomenological implications
• Left-Right Symmetry Breaking and Gravitational Waves : A Tale of Two Phase Transitions
• No-go limitations on UV completions of the Neutrino Option
• Towards a more complete description of hybrid leptogenesis
• Planck Scale Origin of Non-zero ${\theta }_{13}$ and Super-WIMP Dark Matter
• Neutrino parameters in the Planck-scale lepton number breaking scenario with extended scalar sectors
• Minimal dark matter in $SU(5)$ grand unification