Dynamical neutrino mass matrix: large (small) mixing solution to atmospheric (solar) neutrino oscillations

In the wake of the SuperKamiokande announcement of atmospheric neutrino oscillations which favor the large mixing of νμ with ντ, there is considerable theoretical activity towards a possible understanding of the solar neutrino deficit also in terms of the mixing of νe with the other two neutrinos. A specific dynamical model is presented here for the first time which naturally chooses the large (small) mixing solution to atmospheric (solar) neutrino oscillations.