Hubble selection of the weak scale from QCD quantum phase transition

by Prof. Sunghoon Jung (SNU)

Thursday 4 Nov 2021, 10:00 → 12:00 Asia/Seoul

Title: Hubble selection of the weak scale from QCD quantum phase transition

Speaker: Prof. Sunghoon Jung (SNU)

Abstract: If the strange quark were lighter, $\textrm{QCD}$ phase transition could have been first order. This implies that $\textrm{QCD}$ may have quantum critical points as the Higgs vev $\nu_h$ is varied from its Standard Model value. We show that inflationary quantum evolution of $\nu_h$ 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 $Λ_\textrm{QCD}$. We first explore quantum critical points of $N_f=3$ $\textrm{QCD}$, parameterized by $\nu_h$ 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 ~$Λ_\textrm{QCD}$.

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