报告题目：Constraining the number of horizons with energy conditions

报告人：杨润秋 副教授 （天津大学）

报告时间：2021 年 4 月 22 日（周四）15：30-16：30

报告地点：32教学楼256室（腾讯会议 ID : 375 3347 0839）

报告摘要：

We show that the number of horizons of static black holes can be strongly constrained by classic matters. With very general conditions, we prove that if the interior of a static black hole satisfies strong energy condition or null energy condition, there is at most one non-degenerated inner horizon behind the event horizon; in addition, if the event horizon is degenerated, there exists no inner horizon. Our result offers some universal restrictions on the number of horizons. Interestingly and importantly, it also suggests that classical matter not only promotes the formation of event horizon but also prevents the appearance of multiple horizons inside black holes. Furthermore, using the geometrical construction, we obtain a radially conserved quantity which is valid for general static spacetimes.

报告人简介：

杨润秋，2011年本科毕业于北京师范大学物理系，2016年博士毕业于中科院理论物理研究所，2016-2019年在韩国高等研究院从事博士后研究，2019年11月至今在天津大学工作，主要研究方向为黑洞物理和引力全息对偶等方向。

参考文献：

e-Print: 2104.03012 [gr-qc]