Speaker
TaeHun Kim
(Seoul National University)
Description
If the strange quark were lighter, QCD phase transition could have been first order. This implies that QCD may have quantum critical points as the Higgs vev v_h is varied from its Standard Model value. We show that inflationary quantum evolution of v_h with the relaxion can drive our universe toward those critical points, realizing the weak scale close to the observed value while explaining its closeness to \Lambda_{\rm QCD}. We first explore quantum critical points of N_f=3 QCD, parameterized by v_h at T=0, and present a basic model for the weak scale. It results in a sharply localized probability distribution of the weak scale, which is critical not to the crossover at zero but to the quantum transition at ~\Lambda_{\rm QCD}.
