| Speaker: | Kohei Kamada (Hangzhou Institute for Advanced Study, U of Chinese Academy of Sciences) |
|---|---|
| Title: | B-L magnetic helicity and lepton asymmetry from axion inflation |
| Date (JST): | Tue, Sep 30, 2025, 13:30 - 14:30 |
| Place: | Seminar Room B |
| Abstract: | In the context of axion inflation, inflaton can couple to gauge fields through the Chern-Simons coupling.This coupling gives rise to an instability of helical U(1) gauge fields. If the B-L symmetry in the Standard Model is gauged, at the end of inflation through the chiral anomaly we have helical B-L magnetic fields and B-L asymmetry in the visible and sterile sector, while the total B-L asymmetry vanishes. It can be possible that all the asymmetry finally cancels out in the thermal history of the Universe after inflation. But we succeeded in constructing a scenario where the present baryon asymmetry can be explained through the B-L genesis in this model. In this talk, I explain the essence for this scenario to be successful. |
