Probing new physics effects of the first-order phase transition

by Prof. Katsuya Hashino (Fukushima College)

Tuesday 11 Mar 2025, 10:30 → 11:30 Asia/Shanghai

B105 (CHEP)

In the Higgs potential of the standard model, it is known that the electroweak phase transition in the early universe is a crossover. However, the phase transition can occur as first-order when new physics effects contribute to the potential. If the first-order phase transition took place in the early universe, the graitational waves are produced by bubble collision. Since the energy of gravitational waves depend on the shape of the potential, it may be possible to explore the new physics effects in the potential through their observations. However, the spectrum of gravitational wave from first-order phase transition has some theoretical uncertainties.
In this talk, we focus on some models beyond the standard model as an example, and discuss testaibility of them through the obseration of graitational wave. We take into account theoretical uncertainties, particularly those arising from renormalization group running effects, in the GW spectrum and discuss how precisely new physics effects can be probed.

Bio:
Katsuya Hashino received his Ph. D from University of Toyama in 2019, and is now an assistant professor at Fukushima College. He has worked at Osaka University, Peking University and Tokyo University of Science as a postdoc. His main interest is Higgs physics. Especially, he has focused on the dynamics of electroweak phase transitions in the early Universe.

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