Speaker
Wei-Chih Huang
(University College London)
Description
In the context of the type-I seesaw mechanism, when there is an underlying discrete flavor symmetry, such as $\mu-\tau$ symmetry at work, $\theta_{13}$ in the active neutrino mixing matrix is zero and leptogenesis can not work since there are no complex phases in the heavy-light neutrino mixing. In this work, we demonstrate that the existence of dark matter, which violates the flavor symmetry, renders $\theta_{13}$ non-zero via radiative corrections and provides the complex phase(s) needed for leptogenesis. We also briefly comment on possibilities of explaining BICEP$2$ results based on inflation.
Authors
Dr
Alfredo Urbano
(SISSA)
Wei-Chih Huang
(University College London)
Dr
valerie domcke
(SISSA)
