Abstract
General classes of mechanisms for generating small neutrino masses are surveyed from a top-down (superstring) perspective. In particular, string constructions have motivated various possibilities involving higher-dimensional operators, string instantons, and wave-function overlaps in large or warped extra dimensions. These constructions may yield small Dirac masses, Majorana masses via the Weinberg operator, or Majorana masses from a seesaw mechanism, although the last typically differ in detail from the more conventional Grand Unified Theory models. Possibilities for mixing between light, active neutrinos and sterile neutrinos are surveyed.
Original language | English (US) |
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Pages (from-to) | 215-235 |
Number of pages | 21 |
Journal | Annual Review of Nuclear and Particle Science |
Volume | 62 |
DOIs | |
State | Published - 2012 |
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics