Numerical binary black hole mergers in dynamical Chern-Simons gravity: Scalar field
Numerical binary black hole mergers in dynamical Chern-Simons gravity: Scalar field
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DOI：
10.1103/physrevd.96.044020
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发表时间：
2017-05
影响因子：
5
通讯作者：
M. Okounkova;L. Stein;M. Scheel;D. Hemberger
中科院分区：
文献类型：
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作者：
M. Okounkova;L. Stein;M. Scheel;D. Hemberger
在非线性、动力学、强场引力区域检验广义相对论是引力波天体物理学的主要目标之一。要进行广义相对论(GR)的精度测试，需要在广义相对论之外的理论中为二元黑洞(BBH)系统提供数值激励、合并和振铃波形。目前，GR和标量张量引力是唯一适合数值模拟的理论。在这篇文章中，我们提出了一个适定的摄动格式，用于数值积分对GR具有连续极限的Beyond-GR理论。我们通过模拟动态Chern-Simons引力(DCS)中的BBH合并，证明了这一方案在微扰参数中线性数量级。通过数值模拟，给出了离散控制系统伪标量场的模式波形和能量通量。我们发现很好地符合早期的分析预测，包括没有伪标量偶极辐射。我们发现了只有通过数值才能接触到的新现象学：合并过程中的偶极辐射爆发。我们还量化了微扰格式的自洽。最后，我们估计了GR相容的LIGO探测可以置于新的分布式控制系统长度尺度上的界限，大约是L≲O(10)公里。
Testing general relativity in the nonlinear, dynamical, strong-field regime of gravity is one of the major goals of gravitational wave astrophysics. Performing precision tests of general relativity (GR) requires numerical inspiral, merger, and ringdown waveforms for binary black hole (BBH) systems in theories beyond GR. Currently, GR and scalar-tensor gravity are the only theories amenable to numerical simulations. In this article, we present a well-posed perturbation scheme for numerically integrating beyond-GR theories that have a continuous limit to GR. We demonstrate this scheme by simulating BBH mergers in dynamical Chern-Simons gravity (dCS), to linear order in the perturbation parameter. We present mode waveforms and energy fluxes of the dCS pseudoscalar field from our numerical simulations. We find good agreement with analytic predictions at early times, including the absence of pseudoscalar dipole radiation. We discover new phenomenology only accessible through numerics: a burst of dipole radiation during merger. We also quantify the self-consistency of the perturbation scheme. Finally, we estimate bounds that GR-consistent LIGO detections could place on the new dCS length scale, approximately l ≲ O(10)km.