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arXiv 2107.04890gr-qc
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超反冲双星黑洞系统发射引力波的普适特征

Universal features of gravitational waves emitted by superkick binary black hole systems

Sizheng Ma, Matthew Giesler, Vijay Varma, Mark A. Scheel, Yanbei Chen

发表信息：
Phys. Rev. D 104, 084003 (2021)
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摘要：

我们使用数值相对论来研究“超级反冲”二元黑洞系统（具有相同质量和反平行自旋的系统）的合并和衰荡阶段。我们找到了一种通用的方法来描述这些系统在合并和衰荡阶段发射的质量和电流四极引力波：（i）这些波的时间演化是不敏感的祖先的参数（自旋）后，由自己的峰值归一化。(ii)峰值，编码所有的自旋信息的祖先，可以始终符合公式的启发后牛顿理论。我们发现质量四极波的普适演化可以用所谓的后向单体（BOB）模型精确地模拟。然而，BOB模型，在其目前的形式，导致一个较低的波形匹配和一个显着的参数估计偏置电流四极波。我们还将振铃信号分解为七个泛音，并研究了模式振幅对祖波参数的依赖关系。这种依赖性被发现是不敏感的泛音指数（缩放因子）。最后，我们使用Fisher矩阵技术来研究如何振铃波形可以至少作为重要的参数估计的inspiral阶段。假设宇宙探测器，我们发现的贡献衰荡部分占主导地位的总质量超过~ 250太阳质量。对于大规模BBH系统，通过引入衰荡信息，提高了参数测量的准确性--衰荡扇区产生了与内旋阶段不同的参数相关性，从而降低了全信号中的总体参数相关性。

英文摘要：

We use numerical relativity to study the merger and ringdown stages of "superkick" binary black hole systems (those with equal mass and anti-parallel spins). We find a universal way to describe the mass and current quadrupole gravitational waves emitted by these systems during the merger and ringdown stage: (i) The time evolutions of these waves are insensitive to the progenitor's parameters (spins) after being normalized by their own peak values. (ii) The peak values, which encode all the spin information of the progenitor, can be consistently fitted to formulas inspired by post-Newtonian theory. We find that the universal evolution of the mass quadrupole wave can be accurately modeled by the so-called Backwards One-Body (BOB) model. However, the BOB model, in its present form, leads to a lower waveform match and a significant parameter-estimation bias for the current quadrupole wave. We also decompose the ringdown signal into seven overtones, and study the dependence of mode amplitudes on the progenitor's parameters. Such dependence is found to be insensitive to the overtone index (up to a scaling factor). Finally, we use the Fisher matrix technique to investigate how the ringdown waveform can be at least as important for parameter estimation as the inspiral stage. Assuming the Cosmic Explorer, we find the contribution of ringdown portion dominates as the total mass exceeds ~ 250 solar mass. For massive BBH systems, the accuracy of parameter measurement is improved by incorporating the information of ringdown -- the ringdown sector gives rise to a different parameter correlation from inspiral stage, hence the overall parameter correlation is reduced in the full signal.

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