Lepton flavor model from Δ(54) symmetry

We present the lepton flavor model with Delta(54), which appears typically in heterotic string models on the T-2/Z(3) orbifold. Our model reproduces the tri-bimaximal mixing in the parameter region around degenerate neutrino masses or two massless neutrinos. We predict the deviation from the tri-bimaximal mixing by putting the experimental data of neutrino masses in the normal hierarchy of neutrino masses. The upper bound of sin(2)theta(13) is 0.01. There is the strong correlation between theta(23) and theta(13). Unless theta(23) is deviated from the maximal mixing considerably, theta(13) remains to be tiny.