报告人：Eugen Radu博士（葡萄牙阿威罗大学）

题目: Challenging the Reissner-Nordstrom paradigm: static black holes with non-spherical horizons

Zoom ID：871 5017 0958

时间：2022年1月13日（周五）下午16:00

联系人：魏少文（Shao-Wen Wei）

报告摘要:

Static (single, asymptotically flat) black holes (BHs) in electrovacuum can only have an electric monopole, and they are necessarily spherically symmetric. We discuss two different mechanisms to circumvent this result. In the first case, we show that static BHs in AdS-electrovacuum can have an arbitrary electric multipole structure, and present explicit examples of static BHs with no continuous (spatial) symmetries. The second example consists in asymptotically flat scalarized BHs in a class of Einstein-Maxwell-scalar (EMS) models. The corresponding BHs bifurcate from the Reissner-Nordstrom BH trunk, forming an infinite (countable) number of branches, and possess a large freedom in their multipole structure. Unlike the case of electrovacuum, the EMS model admits static, asymptotically flat, regular on and outside the horizon BHs without spherical symmetry and even without any spatial isometries, which are thermodynamically preferred over the electrovacuum state.

报告人简介：

Eugen Radu is an assistant researcher in the University of Aveiro, Portugal. He obtained his Ph.D. in 2002 from Albert-Ludwigs-Universitat Freiburg, Germany. His research interests include gravitational waves, ultracompact objects, and (hairy) black holes. He has published more than 200 papers including 15 in PRL, and his H-index is 49.