Exceptional Points and Resonance in Black Hole Ringdown
Center of Gravity, Niels Bohr Institute（引力中心，尼尔斯·玻尔研究所）；Dipartimento di Fisica, “Sapienza” Universit‘a di Roma & Sezione INFN Roma1（罗马第一大学物理系与INFN罗马一分部）；Institute for Cosmic Ray Research, The University of Tokyo（宇宙线研究所，东京大学）；Department of Physics, Tokyo Metropolitan University（东京都立大学物理系）
We propose an exceptional-point (EP) framework for black-hole ringdown beyond the standard quasinormal-mode (QNM) paradigm. It provides a first-principles characterization of the resonance associated with avoided crossings near EPs, an effect that conventional QNM analysis cannot fully capture. Employing a phenomenological environmental black-hole model with the hyperboloidal framework, we identify near-coalescence of both QNM eigenvalues and eigenfunctions, and directly demonstrate that the resonance produces enhanced mode contributions in the time domain, resulting in characteristic departures from exponentially damped oscillations. Our formulation further reveals that the EP frequency, given by the average of the resonant modes, emerges as the physically relevant observable in the near-EP regime, and offers a robust foundation for modeling and extracting resonant ringdown signals.
Identifying Exceptional Points in Black Hole Ringdowns
Nankai University（南开大学）；Yantai University（烟台大学）；The Hong Kong University of Science and Technology（香港科技大学）；The HKUST Jockey Club Institute for Advanced Study（香港科技大学赛马会高等研究院）
Exceptional Points in Quasinormal Spectra of Hairy Black Holes
College of Physics, Sichuan University（四川大学物理学院）；School of Data Science, Shanghai University of Finance and Economics Zhejiang College（上海财经大学浙江学院数据科学学院）
Avoided crossings and resonances in black hole ringdown with coupled fields: A case study of the Einstein-Maxwell-axion system
Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo（东京大学理学研究系早期宇宙研究中心）；Department of Physics, Tokyo Metropolitan University（东京都立大学物理学系）
Shaping black hole resonances I. Black hole ringdown as a spectral filtering process
Universitat de les Illes Balears（巴利阿里群岛大学）；Gran Sasso Science Institute (GSSI)（格兰萨索科学研究所）；INFN, Laboratori Nazionali del Gran Sasso（意大利国家核物理研究所，格兰萨索国家实验室）
Institute of Theoretical Physics, Chinese Academy of Sciences（中国科学院理论物理研究所）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；Department of Physics, Yantai University（烟台大学物理系）；School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences（中国科学院大学杭州高等研究院基础科学与技术学院）
Exceptional Lines and Excitation of (Nearly) Double-Pole Quasinormal Modes: A Semi-Analytic Study in the Nariai Black Hole
Kyoto University（京都大学）；Yukawa Institute for Theoretical Physics, Kyoto University（京都大学汤川理论物理研究所）；The Hakubi Center for Advanced Research, Kyoto University（京都大学博雅中心）；RIKEN iTHEMS（理化学研究所iTHEMS）；Kindai University（近畿大学）
Eccentricity in Disguise? Insights from GW231123 and Numerically Simulated Binary Black Hole Merger Signals
Max Planck Institute for Gravitational Physics (Albert Einstein Institute)（马克斯·普朗克引力物理研究所（爱因斯坦研究所））；Institute for Gravitation & the Cosmos, Department of Physics, Penn State University（宾夕法尼亚州立大学引力与宇宙学研究所物理学系）；Indian Institute of Technology, Bombay（印度理工学院孟买分校）；Gran Sasso Science Institute (GSSI)（格兰萨索科学研究所）；INFN, Laboratori Nazionali del Gran Sasso（意大利国家核物理研究所格兰萨索国家实验室）；School of Physics and Astronomy and Institute for Gravitational Wave Astronomy, University of Birmingham（伯明翰大学物理与天文学院及引力波天文学研究所）
Exceptional points and near-extremal boundary response in rotating BTZ black holes
Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences（中国科学院大学杭州高等研究院）；Huaihua University（怀化学院）；Hunan Normal University（湖南师范大学）；Beijing Normal University（北京师范大学）；Yangzhou University（扬州大学）
Center for Gravitation and Cosmology, College of Physical Science and Technology, Yangzhou University（扬州大学物理科学与技术学院引力与宇宙学中心）；School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS（中国科学院大学杭州高等研究院基础物理与数学学院）；Escola de Engenharia de Lorena, Universidade de São Paulo（圣保罗大学洛雷纳工程学院）
Zero-damped modes of near-extremal Reissner--Nordström black holes from exact WKB
Max Planck Institute for Physics (Werner Heisenberg Institute)（马克斯·普朗克物理研究所）；Department of Particle Physics and Astrophysics, Weizmann Institute of Science（魏茨曼科学研究所粒子物理与天体物理系）；Institute for Astroparticle Physics, Karlsruhe Institute of Technology（卡尔斯鲁厄理工学院高能天体物理研究所）；Department of Physics, Technical University of Munich（慕尼黑工业大学物理系）；PRISMA ++ Cluster of Excellence & Mainz Institute for Theoretical Physics, Johannes Gutenberg University（约翰内斯·古腾堡大学PRISMA++卓越集群与美因茨理论物理研究所）
