Speaker
Geraldine Servant
(DESY and U. Hamburg)
Description
Zoom meeting: https://cern.zoom.us/j/7930190483 (password: see email)
Format: 40 minutes talk + 20 min discussion
Virtual Axion Institute: The discussion on this talk can be continued in Geraldine's virtual guest office.
https://mattermost.web.cern.ch/axions/channels/geraldine-servant
Abstract: Five years ago, a new mechanism was proposed to address the Higgs mass hierarchy problem through the cosmological evolution of an axion particle, the "relaxion". I will discuss several stopping mechanisms for the relaxion, in particular the effect of axion fragmentation that was omitted in the former literature. I will present the implications for the relaxion parameter space and which new opportunities for model building are opened.
