Speaker
Prof.
Yue Zhang
Description
The QCD axion does not need to be a perfect pseudoscalar for solving the strong CP problem. I will discuss a cosmological role of such imperfectness by solving the domain wall problem that prevails in post-inflationary axion models with discrete symmetry. Effective operators, where the Peccei-Quinn field linearly couples to Standard Model particles, can provide a dynamical solution to the domain wall problem and lead to useful predictions in the axion mass range and interactions.
Author
Prof.
Yue Zhang
