Post-Newtonian gravitational and scalar waves in scalar-Gauss–Bonnet gravity
Post-Newtonian gravitational and scalar waves in scalar-Gauss–Bonnet gravity
复制标题
标量高斯邦尼重力中的后牛顿引力和标量波
DOI：
10.1088/1361-6382/ac4196
复制
发表时间：
2022
影响因子：
3.5
通讯作者：
Witek, Helvi
中科院分区：
文献类型：
--
作者：
Shiralilou, Banafsheh;Hinderer, Tanja;Nissanke, Samaya M;Ortiz, Néstor;Witek, Helvi
黑洞双星螺旋和合并所发出的引力波使得前所未有的强场引力测试成为可能，这需要在广义相对论的扩展中对预期信号进行精确的理论建模。在本文中，我们在标量高斯-邦纳引力理论模型的引力波发射的螺旋双星。超越弱耦合近似，我们推导出的引力波形相对第一后牛顿超越四极近似和计算新的贡献，从非线性曲率项。我们还计算超出前导− 0.5 PN阶项的相对0.5 PN阶标量波形。我们量化这些条款的影响，并提供准备实施的引力波和标量波形，以及准圆双星的傅立叶域相位。我们还进行了参数空间的研究，这表明黑洞标量电荷的值起着至关重要的作用，偏离广义相对论的可检测性。我们还比较了标量波形的数值相对论模拟，以评估相对论修正的标量辐射的影响。我们的研究结果为今后的重力精密试验提供了重要的基础。
Gravitational waves emitted by black hole binary inspiral and mergers enable unprecedented strong-field tests of gravity, requiring accurate theoretical modeling of the expected signals in extensions of general relativity. In this paper we model the gravitational wave emission of inspiralling binaries in scalar Gauss–Bonnet gravity theories. Going beyond the weak-coupling approximation, we derive the gravitational waveform to relative first post-Newtonian order beyond the quadrupole approximation and calculate new contributions from nonlinear curvature terms. We also compute the scalar waveform to relative 0.5 PN order beyond the leading− 0.5 PN order terms. We quantify the effect of these terms and provide ready-to-implement gravitational wave and scalar waveforms as well as the Fourier domain phase for quasi-circular binaries. We also perform a parameter space study, which indicates that the values of black hole scalar charges play a crucial role in the detectability of deviation from general relativity. We also compare the scalar waveforms to numerical relativity simulations to assess the impact of the relativistic corrections to the scalar radiation. Our results provide important foundations for future precision tests of gravity.