Transformative A_4 Mixing of Neutrinos with CP Violation

A new theoretical insight into the pattern of neutrino mixing and leptonic $CP$ violation is presented. It leads naturally and uniquely to a specific dark sector of three real neutral scalar singlets, with the radiative implementation of the inverse seesaw mechanism for neutrino mass. The new simple but crucial enabling idea is that a familiar $A_4$ transformation turns any orthogonal $3 \times 3$ matrix into one which predicts $θ_{23} = π/4$ and $δ_{CP} = \pm π/2$ for the neutrino mixing matrix, in good agreement with present data.

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