题 目：Shaving off soft hairs and black hole image memory effect
报告人：侯绍齐 副教授 武汉大学
时 间：2026年6月5日（星期五）10:00-11:30
地 点：虎溪校区理科楼LE201
邀请人：林子超
报告摘要：Soft hairs of black holes are the Noether charges associated to the generalized Bondi-Metzner-Sachs symmetries. In this work, the images of soft-haired Kerr black holes were studied. For an eternal black hole, the image is rotated, dilated and drifting compared to that of the bald counterpart in the celestial plane. The rotation and the dilation are independent of the time, while the drifting is at a constant speed and in a fixed direction. These effects all depend on angular directions. The soft hair of an astronomical black hole can change due to the emission of the gravitational or electromagnetic wave from the various physical processes occurring in the vicinity of the horizon. Then, the image roams in the observer's view, causing the image memory effect, the smoking gun for the existence of the soft hair. The magnitude of the image memory effect of a huge, spinning black hole accompanied by a much smaller one was estimated.
侯绍齐，武汉大学副教授。本科毕业于山东大学（2010），博士毕业于美国阿拉巴马大学(2016年)，先后在华中科技大学和武汉大学从事博士后研究工作，曾任武汉大学特聘副研究员，现为武汉大学副教授。主要研究兴趣为引力波物理，涉及修改引力理论中引力波偏振、引力波记忆效应、透镜效应对引力波的影响等。