Alternatives to the Seesaw:. Extra Z's and Constraints on Large Extra Dimensions

  title={Alternatives to the Seesaw:. Extra Z's and Constraints on Large Extra Dimensions},
  author={Paul Langacker},
  journal={International Journal of Modern Physics A},
  • P. Langacker
  • Published 4 April 2003
  • Physics
  • International Journal of Modern Physics A
Alternatives to the traditional grand unified theory seesaw for neutrino masses are briefly described. These include the possibility of large extra dimensions and various possibilities for models involving an extra U(1)′ gauge symmetry. The difficulty of observing Majorana phases in neutrinoless double beta decay is also briefly commented on. 
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