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arXiv 2403.04853hep-thgr-qchep-ph
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第四后闵可夫斯基阶的局域时间守恒二体动力学

Local-in-time Conservative Binary Dynamics at Fourth Post-Minkowskian Order

Christoph Dlapa, Gregor Kälin, Zhengwen Liu, Rafael A. Porto

AI总结:

本文通过从完整保守值中移除非局域时间贡献,推导出第四后闵可夫斯基阶的普适局域时间守恒动力学,重构了径向作用量、质心动量和哈密顿量,并验证了与后牛顿结果的一致性,为引力束缚二体的波形建模提供了最精确的散射数据描述。

摘要:

利用散射信息描述一般轨道中的二体系统,需要识别局域时间与非局域时间的尾效应。我们在此报告第四后闵可夫斯基阶,即 ${\cal O}(G^4)$ 阶普适(无自旋)局域时间守恒动力学的推导。这一结果通过计算偏转角的非局域时间贡献,并将其从文献 [2112.11296, 2210.05541] 中的完整守恒值中移除而获得。与总结果不同,该积分问题涉及两个尺度——速度与质量比,并包含多重对数函数、完全椭圆积分以及迭代椭圆积分,尤其是在质量比方面表现突出。我们重构了局域径向作用量、质心动量和哈密顿量,以及精确的对数依赖部分,所有这些对一般轨道均有效。我们将剩余的椭圆型运动非局域项纳入到第六后牛顿阶。合并后的哈密顿量在与当前最先进的后牛顿结果重叠区域完全一致。本文所呈现的结果提供了迄今为止利用散射数据对引力束缚二体系统最精确的描述,可直接应用于波形建模。

英文摘要:

Leveraging scattering information to describe binary systems in generic orbits requires identifying local- and nonlocal-in-time tail effects. We report here the derivation of the universal (non-spinning) local-in-time conservative dynamics at fourth Post-Minkowskian order, i.e. ${\cal O}(G^4)$. This is achieved by computing the nonlocal-in-time contribution to the deflection angle, and removing it from the full conservative value in [2112.11296,2210.05541]. Unlike the total result, the integration problem involves two scales, velocity and mass ratio, and features multiple polylogarithms, complete elliptic and iterated elliptic integrals, notably in the mass ratio. We reconstruct the local radial action, center-of-mass momentum and Hamiltonian, as well as the exact logarithmic-dependent part(s), all valid for generic orbits. We incorporate the remaining nonlocal terms for elliptic-like motion to sixth Post-Newtonian order. The combined Hamiltonian is in perfect agreement in the overlap with the Post-Newtonian state of the art. The results presented here provide the most accurate description of gravitationally-bound binaries harnessing scattering data to date, readily applicable to waveform modelling.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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