Speaker: 朱江 (上海交通大学李政道研究所)
Time: 2025-11-27 15:00-16:00
Location: 1510, SIMIS
Zoom Meeting ID: 859 0561 4568 Passcode: SIMIS
摘要：
We discuss the catalysis of the primordial black holes(PBH) on the first-order electroweak phase transition(FOEWPT). We accurately studied the nucleation rate for bubbles around the PBH by solving the Einstein and bounce equations rather than applying the thin-wall approximation. We found the ordinary thin-wall approximation will overestimate the nucleation rate. For the first time, we showed how the PBH altered the parameters space of new physics. We use the concrete model: the triplet extension of the standard model($\Sigma{\rm SM}$) to demonstrate this effect and found the PBH with suitable mass $M_{PBH}<10^{11}g$ will nearly double the viable parameter space for the two-step FOEWPT in $\Sigma{\rm SM}$. Those PBHs will also induce a supercooling FOEWPT in the new extended parameter regions and generate an observable stochastic gravitational wave signal without changing the observational signal for ordinary parameters space.
About Speaker:
Dr. Jiang Zhu is currently a postdoc from T.D. Lee institute. He received his Ph.D. from Huazhong University of Science and Technology in 2023. His research interests include particle physics, the physics beyond standard model, gravitational waves and the physics of early Universe.
简体中文 
English