Scotogenic $A_4$ Neutrino Model for Nonzero $\theta_{13}$ and Large   $\delta_{CP}$
  Assuming that neutrinos acquire radiative seesaw Majorana masses through their interactions with dark matter, i.e. scotogenic from the Greek 'scotos' meaning darkness, and using the non-Abelian discrete symmetry $A_4$, we propose a model of neutrino masses and mixing with nonzero $\theta_{13}$ and necessarily large leptonic CP violation, allowing both the normal and inverted hierarchies of neutrino masses, as well as quasi-degenerate solutions. 
Ernest Ma, Alexander Natale, and Ahmed Rashed
hep-ph