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arXiv 2204.09367gr-qc
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基于光子运动的自旋黑洞引力波形模型

Gravitational waveform model based on photon motion for spinning black holes

Song Li, Wen-Biao Han

摘要:

双黑洞合并的波形包括螺旋、合并和衰荡三部分。通常,内旋波可以通过后牛顿近似标定得到,合并波和衰荡波可以通过黑洞微扰理论的准正规模得到。然而,对于更一般的黑洞,准正规模的计算并不是微不足道的。本文利用光子球得到自旋黑洞的准正规模。然后将衰荡波与内旋波相连接,得到完整的波形,并与数值相对论得到的波形进行比较。我们发现它们彼此匹配得很好。原则上,这种方法可以推广到一般的紧致对象。作为例子,给出了参数化轴对称黑洞的衰荡波形。我们也用这种方法得到了加速的末级黑洞的振铃信号,这是由于合并过程中的引力反冲。即使在极端的情况下,由于反冲而产生的加速度也不能产生可检测的影响。

英文摘要:

The waveforms from binary black hole mergers include inspiral, merger, and ringdown parts. Usually, the inspiral waveform can be obtained by calibrating from post-Newtonian approximation; The merger and ringdown ones can be gotten from the quasinormal modes with black hole perturbation theory. However, for more general black holes, the calculation of the quasinormal modes is not trivial. In this paper we use the photon sphere to get the quasinormal modes of spinning black holes. Then we connect the ringdown wave with the inspiral part to get full waveforms and compare with the ones from numerical relativity. We find that they match with each other very well. In principle this method can be extended to some general compact objects. As an example, the ringdown waveforms from parametrized axisymmetric black holes are obtained. We also use this method to get the ringdown signals of the accelerating final black hole; this is due to gravitational recoil during the merger. Even for the extreme cases, the acceleration due to the recoil cannot produce detectable effects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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