Nonlinear Treatment of a Black Hole Mimicker Ringdown,Physical Review Letters

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Nonlinear Treatment of a Black Hole Mimicker Ringdown
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-07-19 , DOI: 10.1103/physrevlett.133.031401
Nils Siemonsen ₁

Affiliation

We perform the first nonlinear and self-consistent study of the merger and ringdown of a black hole mimicking object with stable light rings. To that end, we numerically solve the full Einstein-Klein-Gordon equations governing the head-on collisions of a series of binary boson stars in the large-mass-ratio regime resulting in spinning horizonless remnants with stable light rings. We broadly confirm the appearance of features in the extracted gravitational waveforms expected based on perturbative methods: the signal from the prompt response of the remnants approaches that of a Kerr black hole in the large-compactness limit, and the subsequent emissions contain periodically appearing bursts akin to so-called gravitational wave echoes. However, these bursts occur at high frequencies and are sourced by perturbations of the remnant’s internal degrees of freedom. Furthermore, the emitted waveforms also contain a large-amplitude and long-lived component comparable in frequency to black hole quasinormal modes. We further characterize the emissions, obtain basic scaling relations of relevant timescales, and compute the energy emitted in gravitational waves.

中文翻译：

黑洞模仿者振铃的非线性处理

我们对具有稳定光环的黑洞模仿物体的合并和环衰进行了首次非线性和自洽研究。为此，我们对控制大质量比范围内一系列双玻色子星正面碰撞的完整爱因斯坦-克莱因-戈登方程进行数值求解，从而产生具有稳定光环的旋转无地平线残余物。我们大致确认了基于微扰方法提取的引力波形中预期的特征：残余物的即时响应信号接近大致密极限中的克尔黑洞，随后的发射包含周期性出现的类似爆发所谓的引力波回波。然而，这些爆发以高频率发生，并且源自残余物内部自由度的扰动。此外，发射的波形还包含频率与黑洞准正常模式相当的大振幅和长寿命分量。我们进一步表征发射，获得相关时间尺度的基本标度关系，并计算引力波发射的能量。

更新日期：2024-07-19

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