报告题目：Black Hole Quasinormal Mode Resonances

报告人：杨一秋 在读博士（芝加哥大学）

报告时间：2025 年 12 月 03 日（周三）9 : 00-10 : 30

报告地点：线上报告

报告摘要：

Black hole quasinormal mode frequencies can be very close to each other (“avoided crossings”) or even completely degenerate (“exceptional points”) when the system is characterized by more than one parameter. We investigate this resonant behavior and demonstrate that near exceptional points, the two modes are just different covers of the same complex function on a Riemann surface. We also study the characteristic time domain signal due to the resonance in the frequency domain, illustrating the analogy between black hole signals at resonance and harmonic oscillators driven by a resonant external force. We consider a specific toy model displaying a resonance between the fundamental mode and the first overtone, and we find that taking into account the linear growth in time due to the resonance is necessary to accurately recover the quasinormal mode frequencies.

报告人简介：

       杨一秋，2024年暑期访问Johns Hopkins大学，2025年于北京大学物理系获学士学位，现为芝加哥大学物理系博士生，研究方向主要为高能物理、引力波。