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Abstract

We explore a simple but extremely predictive extension of the scotogenic
model. We promote the scotogenic symmetry $\mathbb{Z}_2$ to the flavour
non-Abelian symmetry $\Sigma(81)$, which can also automatically protect dark
matter stability. In addition, $\Sigma(81)$ leads to striking predictions in
the lepton sector: only Inverted Ordering is realised, the absolute neutrino
mass scale is predicted to be $m_\text{lightest} \approx 7.5 \times 10^{-4}$ eV
and the Majorana phases are correlated in such a way that $|m_{ee}| \approx
0.018$ eV. The model also leads to a strong correlation between the solar
mixing angle $\theta_{12}$ and $\delta_{CP}$, which may be falsified by the
next generation of neutrino oscillation experiments. The setup is minimal in
the sense that no additional symmetries or flavons are required.