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arXiv 2408.01871gr-qchep-th
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从引力自作用力和康普顿振幅推导自旋对齐双星在自旋六阶下的后牛顿观测量

Post-Newtonian observables for aligned-spin binaries to sixth order in spin from gravitational self-force and Compton amplitudes

Yilber Fabian Bautista, Mohammed Khalil, Matteo Sergola, Chris Kavanagh, Justin Vines

AI总结:

本文针对致密双星引力波建模需求,推导了自旋对齐双星保守动力学在自旋³至自旋⁶阶下的新后牛顿结果,结合Tutti Frutti方法与黑洞微扰理论的康普顿振幅解决歧义,还推导了克尔背景散射角及偏心轨道不变量。

摘要:

致密双星的精确建模对于引力波探测和参数估计至关重要,自旋是波形模型中需要包含的重要效应。本文推导了保守自旋对齐动力学在自旋³和自旋⁴贡献的次次领先阶(NNLO),以及自旋⁵和自旋⁶贡献的次领先阶(NLO)下的新后牛顿(PN)结果。我们采用的一种方法是Tutti Frutti方法,该方法通过红移和自旋进动不变量,利用散射角对对称质量比的简单依赖关系,将后牛顿结果与引力自作用力结果联系起来。然而,由于红移中克尔自旋的超越函数,在NLO自旋⁵贡献处出现了歧义;这也是康普顿振幅计算受到虚假极点影响的阶数。因此,我们采用另一种方法来确定NLO自旋⁵和自旋⁶动力学:使用从黑洞微扰理论获得的在壳康普顿振幅。本文中使用的康普顿振幅由文献[Phys. Rev. D 109, 084071 (2024)]中报道的无歧义树级远区部分,以及来自近区的完整、不与远区干涉的ℓ=2分波贡献组成,后者负责捕捉克尔有限大小效应。本文的其他结果包括从参数化世界线作用量推导克尔背景中自旋测试体的散射角,以及在不进行偏心展开的情况下计算偏心轨道的红移和自旋进动不变量。

英文摘要:

Accurate modeling of compact binaries is essential for gravitational-wave detection and parameter estimation, with spin being an important effect to include in waveform models. In this paper, we derive new post-Newtonian (PN) results for the conservative aligned-spin dynamics at next-to-next-to-leading order for the spin$^3$ and spin$^4$ contributions, in addition to the next-to-leading order (NLO) spin$^5$ and spin$^6$ contributions. One approach we follow is the Tutti Frutti method, which relates PN and gravitational self-force results through the redshift and spin-precession invariants, by making use of the simple dependence of the scattering angle on the symmetric mass ratio. However, an ambiguity arises at the NLO spin$^5$ contribution, due to transcendental functions of the Kerr spin in the redshift; this is also the order at which Compton amplitudes calculations are affected by spurious poles. Therefore, we follow an additional approach to determine the NLO spin$^5$ and spin$^6$ dynamics: using on-shell Compton amplitudes obtained from black hole perturbation theory. The Compton amplitude used in this work is composed of the unambiguous tree-level far-zone part reported in [Phys. Rev. D 109, 084071 (2024)], as well as the full, non-interfering with the far-zone, $\ell=2$ partial wave contributions from the near zone, which are responsible for capturing Kerr finite-size effects. Other results in this paper include deriving the scattering angle of a spinning test body in a Kerr background from a parametrized worldline action, and computing the redshift and spin-precession invariants for eccentric orbits without an eccentricity expansion.

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