"[W]e investigated the effects of introducing an effective transition electromagnetic dipole moment [EMDM] operator between the LH light and the RH heavy neutrinos. ...As a result, a new scenario for leptogenesis whereby the lepton asymmetry is solely generated by the EMDM-type (instead of the usual Yukawa-mediated) interactions is possible. By exploring the key ingredients leading to , we have shown by explicit computations of the relevant diagrams in a toy model that, in principle, electromagnetic leptogenesis is a viable alternative for creating a lepton asymmetry. ...[T]here is no doubt that transition EMDM interactions between light and heavy neutrinos can have far-reaching consequences in the early universe."
January 1, 1970