Modeling the ringdown from precessing black hole binaries
Modeling the ringdown from precessing black hole binaries
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DOI：
10.1103/physrevd.103.084048
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发表时间：
2021-02
影响因子：
5
通讯作者：
E. Finch;C. Moore
中科院分区：
文献类型：
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作者：
E. Finch;C. Moore
模拟双黑洞合并的终点是现代引力波天文学的基石。从衰荡信号中提取多个准正规模式频率，可以对剩余黑洞进行前所未有的详细研究。先前对对齐自旋双星的数值相对论模拟的研究发现，如果包括泛音（可能还有镜像模式），则可能比以前想象的更早开始振铃分析。这增加了振铃中的信噪比，使次主导模式的识别更容易。在本文中，我们首次研究了具有未对准自旋的黑洞二进制，并发现振铃拟合的性能比对准自旋情况下的变化要大得多。镜像模式和高次谐波的加入，连同沿着的泛音，提高了具有较早开始时间的振铃拟合的可靠性;然而，仍然存在性能较差的拟合的情况。虽然使用泛音结合早期振铃开始时间是一个诱人的可能性，但有必要谨慎行事。我们还首次考虑在这种类型的准正态模式研究中使用数值相对论替代模型，并解决用于拟合的基本数值波形的准确性的重要问题。
Modelling the end point of binary black hole mergers is a cornerstone of modern gravitational-wave astronomy. Extracting multiple quasinormal mode frequencies from the ringdown signal allows the remnant black hole to be studied in unprecedented detail. Previous studies on numerical relativity simulations of aligned-spin binaries have found that it is possible to start the ringdown analysis much earlier than previously thought if overtones (and possibly mirror modes) are included. This increases the signal-to-noise ratio in the ringdown making identification of subdominant modes easier. In this paper we study, for the first time, black hole binaries with misaligned spins and find a much greater variation in the performance of ringdown fits than in the aligned-spin case. The inclusion of mirror modes and higher harmonics, along with overtones, improves the reliability of ringdown fits with an early start time; however, there remain cases with poor performing fits. While using overtones in conjunction with an early ringdown start time is an enticing possibility, it is necessary to proceed with caution. We also consider for the first time the use of numerical relativity surrogate models in this type of quasinormal mode study and address important questions of accuracy in the underlying numerical waveforms used for the fit.