| Speaker: | Kazuo Fujikawa (Riken) |
|---|---|
| Title: | Majorana neutrino in seesaw mechanism and Bogoliubov quasiparticle |
| Date (JST): | Wed, Jan 31, 2018, 13:30 - 14:30 |
| Place: | Seminar Room A |
| Abstract: | The idea that the Majorana neutrino should be identified as a Bogoliubov quasiparticle is applied to the seesaw mechanism for the three generations of neutrinos in the Standard Model. The Bogoliubov transformation in the present context is a CP preserving canonical transformation but modifies charge conjugation properties in such a way that the C-noninvariant fermion number violating term (condensate) is converted to a Dirac mass term. The puzzling aspects associated with the charge conjugation of chiral Weyl fermions are clarified. A sizable fine tuning in the simple version of seesaw mechanism as perceived by the majority of physicists is illustrated for the three generations of neutrinos; the seesaw mechanism is not natural if the model suffers from the hierarchy problem. |
