发表机构
Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo; Department of Physics, Tokyo Metropolitan University（东京大学理学研究系早期宇宙研究中心; 东京都立大学物理学系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究以爱因斯坦-麦克斯韦-轴子系统为例，探讨多耦合场黑洞准正规模式谱中的避免交叉及其共振特性，发现特定初始扰动下有效衰减变慢且两分支物理特性交换，并验证了QNM重构能准确再现环衰减波形。
AI 中文摘要
黑洞准正规模式（QNM）谱中的避免交叉表现出特征性的共振性质，包括增强的激发因子。我们将这一现象的研究扩展到具有多个耦合场的微扰系统，并探讨其对环衰减波形的影响。作为具体例子，我们考虑爱因斯坦-麦克斯韦-轴子系统中的带电黑洞，其QNM分支可根据在退耦极限下连续连接到的引力、电磁和轴子模式进行分类。我们聚焦于由此定义的引力主导分支与电磁主导分支之间的一个避免交叉。我们验证了QNM重构能准确再现直接演化的时域波形的环衰减部分。在避免交叉附近，特定初始微扰会出现有效更慢的衰减，而两个QNM的共振增强贡献在物理波形中大体相互抵消。QNM分解进一步揭示了两个分支在共振处的物理特性交换。这些结果刻画了具有多个耦合场的系统中共振对黑洞环衰减的影响。
英文摘要
Avoided crossings in black hole quasinormal-mode (QNM) spectra exhibit characteristic resonant properties, including enhanced excitation factors. We extend the study of this phenomenon to perturbation systems with multiple coupled fields and investigate its consequences for ringdown waveforms. As a concrete example, we consider a charged black hole in the Einstein-Maxwell-axion system, whose QNM branches can be classified according to the gravitational, electromagnetic, and axion modes to which they continuously connect in the decoupling limit. We focus on an avoided crossing between the gravity- and electromagnetic-led branches thus defined. We verify that the QNM reconstruction accurately reproduces the ringdown portion of the directly evolved time-domain waveform. Near the avoided crossing, an effectively slower decay emerges for particular initial perturbations, while the resonantly enhanced contributions from the two QNMs largely cancel in the physical waveform. The QNM decomposition further reveals an exchange of the physical characters of the two branches across the resonance. These results characterize the imprint of resonances on black hole ringdown in systems with multiple coupled fields.
Comments12 pages, 5 figures
