论文标题
使用Weyl特征场扩展重力波提取
Extending Gravitational Wave Extraction Using Weyl Characteristic Fields
论文作者
论文摘要
我们提出了一种详细的方法,用于从数值生成的空间中提取完整的纽曼 - 芬罗量标量表,而无需完全正常或完全与主零方向排列。我们还描述了如何在后处理中实施推外技术来计算Weyl标量的贡献。这些方法已用于生成$ψ_4$和$ H $波形,用于模拟极端空位(SXS)波形目录,现在已经扩展了以生成整个Weyl标量。这些新的波形数量对于重力波天文学的未来至关重要,以了解数值波形中可能发生的有限幅度尺度差异。我们还提出了有关光谱爱因斯坦代码产生的波形准确性的新分析。虽然最终我们期望Cauchy特征提取能产生更准确的波形,但此处描述的提取技术更容易实施,并且已经证明是生产生产级别波形的可行方式,可以满足当前重力波检测器的需求。
We present a detailed methodology for extracting the full set of Newman-Penrose Weyl scalars from numerically generated spacetimes without requiring a tetrad that is completely orthonormal or perfectly aligned to the principal null directions. We also describe how to implement an extrapolation technique for computing the Weyl scalars' contribution at asymptotic null infinity in postprocessing. These methods have been used to produce $Ψ_4$ and $h$ waveforms for the Simulating eXtreme Spacetimes (SXS) waveform catalog and now have been expanded to produce the entire set of Weyl scalars. These new waveform quantities are critical for the future of gravitational wave astronomy in order to understand the finite-amplitude gauge differences that can occur in numerical waveforms. We also present a new analysis of the accuracy of waveforms produced by the Spectral Einstein Code. While ultimately we expect Cauchy characteristic extraction to yield more accurate waveforms, the extraction techniques described here are far easier to implement and have already proven to be a viable way to produce production-level waveforms that can meet the demands of current gravitational-wave detectors.