The Peccei-Quinn (PQ) solution to the strong CP problem requires an anomalous global U(1) symmetry, the PQ symmetry. The origin of such a convenient global symmetry is quite puzzling from the theoretical point of view in many aspects. In this talk, we propose a simple prescription which provides an origin of the PQ symmetry. There, the global U(1) PQ symmetry is virtually embedded in a gauged U(1) PQ symmetry. Due to its simplicity, this mechanism can be implemented in many conventional models with the PQ symmetry. Finally, we also propose an attractive concrete model, where a gauged U(1) PQ symmetry corresponds to the B-L gauge symmetry.
|Parallel Session||Formal Field Theory and Strings|