关于举行德国埃尔朗根-纽伦堡大学张聪博士学术报告会的通知

报告题目：Spin foam amplitude of the black-to-white hole transition主 讲 人：张聪博士(德国埃尔朗根-纽伦堡大学物理系)主 持 人：张向东教授报告时间：2024年3月22日(星期五)15:30报告地点：物理楼（18号楼）二楼220室报告厅欢迎广大师生参加。  物理与光电学院2024年3月18日 内容提要：At the end of Hawking evaporation, as the black hole horizon approaches the Planck scale, the effects of quantum gravity become significant. Based on the conjecture that these quantum gravity effects may induce the transition of the black hole into a white hole, this transition amplitude is studied within the framework of the spin foam model. We employ the method of complex critical point to numerically compute the transition amplitude, it is interestingly found that the transition amplitude is dominated by the terms allowing the change in orientation. This finding suggests that the black-to-white hole transition should be accompanied by the tunneling process of a change in orientation. 报告人简介：张聪，波兰华沙大学物理系博士后。2013年本科毕业于北京师范大学天文系，2019年博士毕业于北京师范大学物理系。之后赴波兰华沙大学和德国埃尔朗根-纽伦堡大学物理系进行博士后研究工作。目前主要从事圈量子引力，圈量子宇宙学以及圈量子黑洞的研究，发表SCI论文30余篇。