Speaker
Andrew Cheek
(TDLI, SJTU)
Description
I will present a set of simple KSVZ-type axion models, with a breaking scale similar to the GUT-scale, and which doesn't have a domain wall problem or fine-tuning in the initial misalignment angle. I will use this model to argue that it is experimentally difficult to distinguish whether PQ symmetry is broken before or after inflation. I will describe how GW probes could provide vital information in this direction, giving us a concrete handle of relevant particle physics parameters and the UV physics.
Primary author
Andrew Cheek
(TDLI, SJTU)
