Dr. Hyungjin Kim
Cosmological relaxation of electroweak scale has been proposed as a solution to the hierarchy problem. In the early universe, Higgs mass is scanned by an axion-like particle, relaxion, and it is naturally relaxed to the electroweak scale via a certain feedback loop. After a brief introduction to the relaxion scenario, I will discuss that not only the Higgs mass but also the relaxion mass is relaxed to a parametrically smaller value through the same mechanism. This has interesting phenomenological implications as low energy observers might find the relaxion parameters fine-tuned although the mechanism itself is constructed in a technically natural way. I will show that the relaxion coupling constants to the standard model particle could be a few orders of magnitude larger than ‘natural’ values of coupling constants in Higgs portal models. I will also discuss implications of various experiments in different physic frontiers to the relaxed relaxion model as well as its dark matter phenomenology.
Hosted by Prof. Tsai
All interested persons are invited to attend remotely—email email@example.com for information.