实验黑洞炸弹的终态
End state of the experimental black-hole bomb
- University of Nottingham（诺丁汉大学）
- Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel（格勒诺布尔阿尔卑斯大学，法国国家科学研究中心，格勒诺布尔理工学院，内耳研究所）
- University of Manchester（曼彻斯特大学）
- King’s College London, University of London（伦敦国王学院，伦敦大学）
- Centro de Matemática, Computação（数学与计算中心）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究在实验室中用超流氦排水涡旋模拟黑洞炸弹，通过非线性波相互作用抑制超辐射不稳定性，形成长寿命非平衡稳态，为研究黑洞炸弹非线性演化提供新框架。
AI中文摘要：
旋转黑洞可以通过超辐射散射放大入射波。当这些波被限制时，反复放大引发黑洞炸弹不稳定性，尽管其在天体物理黑洞周围玻色子云模型中起核心作用，但其非线性演化仍知之甚少。在此，我们利用基于超流氦中排水涡旋的引力模拟器，在实验室环境中重现了黑洞炸弹机制。在超流体界面传播的表面波经历有效的旋转时空，并在圆柱形腔内经历反复的超辐射放大。通过调节温度和流动参数，我们实现了低频共振模态的指数增长，随后不稳定性被抑制，并形成长寿命的非平衡稳态。利用空间和时间分辨测量，我们识别出非线性频移、谐波产生以及相干三波和四波混合，这些效应在相互作用模态间重新分配能量。实验黑洞炸弹的这一新颖终态突显了非线性波相互作用在抑制线性理论预期的失控增长及控制系统晚期动力学中的作用。我们的结果建立了研究黑洞炸弹非线性演化的实验室框架，对旋转黑洞周围超轻玻色子场的类似现象具有启示意义。
英文摘要：
Rotating black holes can amplify incident waves through superradiant scattering. When these waves are confined, repeated amplification gives rise to the black-hole bomb instability, whose nonlinear evolution remains poorly understood despite its central role in models of bosonic clouds around astrophysical black holes. Here, we reproduce the black-hole bomb mechanism in a laboratory setting using a gravity simulator based on a draining vortex in superfluid helium. Surface waves propagating on the superfluid interface experience an effective rotating spacetime and undergo repeated superradiant amplification within a cylindrical cavity. By tuning the temperature and flow parameters, we achieve exponential growth of a low-frequency resonant mode, followed by the arrest of the instability and the formation of a long-lived non-equilibrium steady state. Using spatially and temporally resolved measurements, we identify nonlinear frequency shifts, harmonic generation, and coherent three- and four-wave mixing that redistribute energy among interacting modes. This novel end state of the experimental black-hole bomb highlights the role of nonlinear wave interactions in quenching the runaway growth expected from linear theory and governing the system's late-time dynamics. Our results establish a laboratory framework for investigating the nonlinear evolution of black-hole bombs, with implications for analogous phenomena involving ultralight bosonic fields around rotating black holes.
