Speaker
Kaladi Babu
Description
The Peccei-Quinn (PQ) symmetry that solves the strong CP problem, being a global symmetry, suffers from a potential quality problem in that the symmetry is not respected by quantum gravity. In this talk I will present results from an ongoing work (with B. Dutta and R.N. Mohapatra) where we address successfully this problem based on a gauged U(1) symmetry. The PQ symmetry arises accidentally in a family of models and is protected by the gauged U(1) against quantum gravitational corrections. A unified theory based on SO(10) x U(1) gauge symmetry will also be presented, and the resulting axion phenomenology will be discussed.
