Neutrino masses and mixings present one of the few evidence for physics
beyond the Standard Model. Many of the models for neutrino mass
generation includes the introduction of heavy states with which the
neutrinos mix. Upon integrating these states out of the theory, the
effective lepton mixing matrix becomes non-unitary. In this seminar, I
will discuss the current bounds on such non-unitarity and the
possibility of creating a baryon asymmetry in the Early universe through
leptogenesis driven by it.
