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arXiv 2007.11239gr-qchep-th
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第六类后牛顿二元系统的非定域动力学

Sixth post-Newtonian nonlocal-in-time dynamics of binary systems

Donato Bini, Thibault Damour, Andrea Geralico

摘要:

我们完成了我们以前的推导,在第六后牛顿(6PN)的精度,引力相互作用的两体系统的局部时间动力学的两个规范不变的表征其互补的非局部时间动力学。一方面,我们计算的非局部的散射角的hyberboliclike运动的一部分,另一方面,我们计算的非局部的平均(Delaunay)哈密顿椭圆运动的一部分。前者是作为一个大角动量展开式计算的(这里给出的是次-次-领先阶),而后者是作为一个小偏心率展开式计算的(这里给出的是十阶)。我们注意到$ζ(3)$的外观在散射角的非局部部分。椭圆运动的平均哈密顿量,然后产生两个规范不变的观测:能量和近星点进动的轨道频率的函数。我们指出,存在一个隐藏的简单的质量比依赖的引力波能量损失的两体系统。

英文摘要:

We complete our previous derivation, at the sixth post-Newtonian (6PN) accuracy, of the local-in-time dynamics of a gravitationally interacting two-body system by giving two gauge-invariant characterizations of its complementary nonlocal-in-time dynamics. On the one hand, we compute the nonlocal part of the scattering angle for hyberboliclike motions; and, on the other hand, we compute the nonlocal part of the averaged (Delaunay) Hamiltonian for ellipticlike motions. The former is computed as a large-angular-momentum expansion (given here to next-to-next-to-leading order), while the latter is given as a small-eccentricity expansion (given here to the tenth order). We note the appearance of $ζ(3)$ in the nonlocal part of the scattering angle. The averaged Hamiltonian for ellipticlike motions then yields two more gauge-invariant observables: the energy and the periastron precession as functions of orbital frequencies. We point out the existence of a hidden simplicity in the mass-ratio dependence of the gravitational-wave energy loss of a two-body system.

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