First-order phase transitions as the origin of matter, dark matter, and multiverse

by Prof. Ke-Pan Xie（谢柯盼） (Beihang University)

Thursday 30 Apr 2026, 10:00 → 11:00 Asia/Shanghai

Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee Institute)

Abstract: 

 

The process of symmetry breaking in the early Universe can manifest as a first-order phase transition (FOPT), a second-order phase transition, or a smooth crossover. If the breaking proceeds via a FOPT, the unique vacuum bubble nucleation structure and out-of-equilibrium environment can provide the necessary conditions for matter-antimatter asymmetry generation and dark matter formation, and may even produce primordial black holes or a multiverse. This talk will describe the principles of FOPTs, introduce recent progress in new physics mechanism study, and discuss the corresponding phenomenological signals, including gravitational waves and collider signatures.

 

About the speaker: 

 

Ke-Pan Xie is an associate professor at Beihang University. He received his B.S. from Zhejiang University in 2013 and his Ph.D. from Peking University in 2018. He subsequently conducted postdoctoral research at Seoul National University in South Korea and the University of Nebraska-Lincoln in the United States before joining Beihang University in 2022. His research focuses on theoretical particle physics, with particular emphasis on the search for new physics beyond the Standard Model, including particle cosmology and collider phenomenology. He has published over 40 papers in SCI-indexed journals.

 

Online Meeting Room:  

 https://meeting.tencent.com/dm/3fzX1YHd9pa7

 ID:753600465