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arXiv 2204.06007gr-qcastro-ph.HE
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利用未对准的二元黑洞衰荡测量准简正模振幅

Measuring quasi-normal mode amplitudes with misaligned binary black hole ringdowns

Halston Lim, Gaurav Khanna, Scott A. Hughes

摘要:

在最近的工作中,我们研究了如何在振铃阶段的二元聚结不同的模式被激发作为最终的暴跌几何形状的函数。至少在大质量比的限制,我们发现了一个干净的角度之间的映射描述的暴跌和振幅的不同的准正常模式(QNM)构成的衰荡。在这项研究中,我们使用该映射来构建一个波形模型,表示为QNM的总和,其中模式的振幅和相位是由源的暴跌参数。我们首先生成大量的校准波形,并在每个模式振幅和相位的拟合之间进行插值,直到$\ell \leq 8$和$\ell - |m| \leq 4$。我们的校准数据的密度使我们能够解决重要的功能,如相变不连续性大错位。使用我们的振铃波形模型,然后,我们进行贝叶斯参数估计与白高斯噪声证明,在原则上,模式振幅可以测量和用于约束的暴跌几何形状。我们发现,推理大大提高了结合先验信息约束模式的激发,这激励工作,以了解和表征QNM激发取决于合并的几何形状。这些结果是从任意质量和自旋映射模式激发的更广泛努力的一部分,这将有助于在即将到来的引力波测量中表征衰荡波。

英文摘要:

In recent work, we examined how different modes in the ringdown phase of a binary coalescence are excited as a function of the final plunge geometry. At least in the large mass ratio limit, we found a clean mapping between angles describing the plunge and the amplitude of different quasi-normal modes (QNMs) which constitute the ringdown. In this study, we use that mapping to construct a waveform model expressed as a sum of QNMs where the mode amplitudes and phases are determined by the source plunge parameters. We first generate a large number of calibration waveforms and interpolate between fits of each mode amplitude and phase up to $\ell \leq 8$ and $\ell - |m| \leq 4$. The density of our calibration data allows us to resolve important features such as phase transition discontinuities at large misalignments. Using our ringdown waveform model, we then perform Bayesian parameter estimation with added white Gaussian noise to demonstrate that, in principle, the mode amplitudes can be measured and used to constrain the plunge geometry. We find that inferences are substantially improved by incorporating prior information constraining mode excitation, which motivates work to understand and characterize how the QNM excitation depends on the coalescence geometry. These results are part of a broader effort to map the mode excitation from arbitrary masses and spins, which will be useful for characterizing ringdown waves in upcoming gravitational-wave measurements.

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