On vacuum decay catalyzed by (evaporating) black holes

by Dr Kohei Kamada (Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences)

Thursday 9 Jul 2026, 11:00 → 12:00 Asia/Shanghai

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

Abstract:
Vacuum decay is one of the hottest topics in cosmology and particle physics, because now it is one of the promising phenomena to generate detectable gravitational wave background. Recently there is a claim that a small black hole may catalyze the vacuum decay to enhance its rate extremely, which can change the several scenarios of the cosmological phase transitions. Cosmological scenarios with primordial black holes may change our prospect of the GW detection, and moreover, they may lead to the catastrophe of our Universe. If this is the case, such scenarios are strongly constrained.
Therefore, it is important to examine if such an enhancement of vacuum decay rate really takes place.
In this talk, I will explain how such an enhancement of vacuum decay is pointed out,possible problems in the discussion that can change the conclusion,and trials to overcome these problems.

Biography:
Kohei Kamada is a distinguished researcher at Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences. He received his Ph.D from the University of Tokyo in 2011 and has worked at Deutsches Elektronen-Synchrotron (DESY),Ecole Polytechnique Fédérale de Lausanne (EPFL), Arizona State University, and Institute for Basic Science as a postdoc. From 2018 to 2023, he has worked at the University of Tokyo as an Assistant Professor before joining HIAS .His research interest centers on the early Universe cosmology and particle phenomenology. His works also include theoretical consistency of Higgs inflation and baryogenesis from magnetic fields.

Alternative online link: https://meeting.tencent.com/dm/a2oZdzIj872u

ID: 434169338