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In the context of the type-I seesaw mechanism, it is known that $\theta_{13}$is zero and leptogenesis can not be realized if there exists a residual flavorsymmetry resulting in the Tri-Bimaximal neutrino mixing pattern. We propose asimple framework where additional particles, odd under a $Z_2$ symmetry, breakthe residual flavor symmetry and the lightest of the $Z_2$ odd particles is thedark matter candidate. As as result, nonzero $\theta_{13}$, $\delta_{CP}$,leptogenesis and the correct dark matter density can be accommodated. On theother hand, a $Z_2$ odd scalar can play the role of the inflaton with mass of$10^{13}$ GeV motivated by the recent BICEP2 results. Interestingly, the modelcan "generate" $\delta_{CP} \simeq -\pi/2$, preferred by the T2K experiment inthe normal hierarchy neutrino mass spectrum.

The Dark Side of $\theta_{13}$, $\delta_{CP}$, Leptogenesis and Inflation in Type-I Seesaw