主讲人单位 (Speaker's Institute): 香港科技大学物理系

邀请人 (Invited by): 张建东

时间 (Time): 星期三,2022/06/08-15:00 to 16:30

地点 (Location): 星期三,2022/06/08-15:00 to 16:30

摘要 (Abstract): 

We study the impact of a binary companion on black hole superradiance at orbital frequencies away from the gravitational-collider-physics (GCP) resonance bands. A superradiant state can couple to a strongly absorptive state via the tidal perturbation of the companion, thereby acquiring a suppressed superradiance rate. Below a critical binary separation, this superradiance rate becomes negative, and the boson cloud gets absorbed by the black hole. This critical binary separation leads to tight constraints on GCP. Especially, a companion with mass ratio q>0.001 invalidates all GCP fine structure transitions, as well as almost all Bohr transitions except those from the 211 state. Meanwhile, the backreaction on the companion manifests itself as a torque acting on the binary, producing floating/sinking orbits that can be verified via pulsar timing. In addition, the possible termination of cloud growth may help to alleviate the current bounds on the ultralight boson mass from various null detections.

主讲人简介 (Speaker's CV): 

王一，2005 年本科毕业于中国科学技术大学，2009 年在中国科学院理论物理研究所获博士学位。之后在麦吉尔大学、东京大学 IPMU 研究所做博士后研究，以及在剑桥大学任霍金高级学者。2015-2020 年任香港科技大学助理教授，2020 年起香港科技大学物理学系副教授。研究理论物理和宇宙学，发表科研论文一百多篇，被引用五千多次。曾获基金委优秀青年科学基金项目（港澳）资助、香港大学教育资助委员会青年学者奖等。