Cosmological relaxation from dark fermion production
Fang Ye (Korean Advanced Institute of Science and Technology)

Cosmological relaxation of the electroweak scale proposed by Graham, Kaplan and Rajendran (GKR) arises as a solution to the naturalness problem. However, certain downsides exist in the original GKR scenario which relies on the Hubble expansion to dissipate the relaxion energy, such as the extremely small parameters and large e-foldings. In order to avoid these issues, in this work, we investigate the plausibility of using fermion production as a dominant friction source to drain the relaxion energy, maintaining the slow-roll of the relaxion. Benchmark points will be given for successful relaxation, and some remaining issue and the phenomenology will also be discussed.