Speaker
Motoo Suzuki
(ICRR)
Description
The Peccei-Quinn (PQ) symmetry may be badly broken by the quantum gravity effect. I suggest the general prescription to protect the PQ symmetry by the gauge symmetry. Then, I mention its potential cosmological problem due to extra fermions which are introduced to cancel the self and the gravitational anomalies. Finally, I show the simple model with the B-L gauge symmetry, where the PQ symmetry can be sufficiently protected without adding extra fermions.
