Twisted Flavors and Tri/bi-Maximal Neutrino Mixing
  A new framework for handling flavor symmetry breaking in the neutrino sector is discussed where the source of symmetry breaking is traced to the global property of right-handed neutrinos in extra-dimensional space. Light neutrino phenomenology has rich and robust predictions such as the tri/bi-maximal form of generation mixing, controlled mass spectrum, and no need of flavor mixing couplings in the theory. 
Naoyuki Haba, Atsushi Watanabe and Koichi Yoshioka