4D Seminar:

Kyohei Mukaida (CERN)

“Leptogenesis from Axion Inflation”



Abstract:

In inflation models driven by an axion-like particle, the inflaton may have a Chern-Simons coupling to the Standard Model (SM) U(1)_Y. During inflation, this Chern-Simons coupling sources dual production of B+L asymmetry and maximally helical U(1)_Y gauge fields, associated with the SM chiral anomaly equation. In this talk, we will show that this setup assisted by the right-handed Majorana neutrino provides a new leptogenesis mechanism.