Generation of large flavor mixing from radiative corrections
  We provide a model independent criterion which would guarantee a large flavor mixing of two quasi-degenerate Majorana neutrinos at the low scale, irrespective of the mixing at the high scale. We also show that such a situation is realizable for a phenomenologically interesting range of parameters of the weak scale theory. We further show that for a similar condition to be implementable for the three generation case, the CP parity of one of the neutrinos needs to be opposite to that of the others. 
K. R. S. Balaji (IMSc), Amol S. Dighe (CERN), R. N. Mohapatra (U. of   Maryland), M. K. Parida (NEHU)