【4.24; Seminar】2026年粒子天体物理全国重点实验室系列学术报告 #12：Gravitational-Wave Ringdown Signals and Black-Hole Spectroscopy

时间/Time: 2026年4月24日周五上午10:00 / Friday, April 25, 2026, 10:00 a.m.

地点/Location: 多学科楼312会议室 / Meeting Room 312, Multidisciplinary Building

报告人/Speaker: 邵立晶（北京大学）/ Lijing Shao (Peking University)

题目/Title: Gravitational-Wave Ringdown Signals and Black-Hole Spectroscopy

主持人/Host: 易疏序 / Shuxu YI

摘要/Abstract:

According to the no-hair theorem, stationary astrophysical black holes are Kerr black holes, characterized solely by mass and spin. When perturbed, a black hole relaxes to this state via the ringdown phase, emitting gravitational waves with characteristic quasi-normal mode frequencies. These signals serve as a unique fingerprint—analogous to atomic spectra—making their analysis known as black-hole spectroscopy. In this talk, I will outline the current frontiers of ringdown studies, including recent advances, key debates, and emerging consensus, especially from high-signal-to-noise events that test general relativity with growing precision. The future lies in routinely detecting overtones and higher-order modes (akin to atomic excited states), which will be of primary importance for next-generation gravitational-wave detectors. To address this, we developed FireFly, an open-source Bayesian package for efficient multi-mode ringdown analysis, optimized in multiple aspects. The talk will cover theoretical foundations, practical challenges, and the potential of these tools to rigorously test the no-hair theorem and search for Kerr deviations.

个人简介/Biography:

Lijing Shao obtained his PhD degree on Theoretical Physics from the School of Physics at Peking University in 2015. Then he worked as a Junior Scientist for two years in the Albert Einstein Institute in Potsdam Germany, and as a Scientific Staff for one year in the Max Planck Institute for Radio Astronomy in Bonn Germany. In 2018, he joined the Kavli Institute for Astronomy and Astrophysics at Peking University, and now he is an Associate Professor with Tenure. Lijing is the group leader of a Max Planck Partner Group at PKU, funded by the Max Planck Society, and an Alibaba DAMO Academy Young Fellow. Lijing’s main research interests include tests of gravity theories, pulsars and neutron stars, gravitational waves, and new physics beyond the standard model of particle physics.