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arXiv 2406.11564gr-qcastro-ph.CO
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数值相对论准圆轨道参数再探讨

Quasicircular Orbital Parameters for Numerical Relativity Revisited

Alessandro Ciarfella, James Healy, Carlos O. Lousto, Hiroyuki Nakano

AI总结:

本文将数值相对论模拟的准圆轨道参数扩展至3.5PN阶,并纳入Schwarzschild与Kerr极限,使q=1/16双星初始偏心率较3PN降低最高一个数量级,达到约10^-3。

摘要:

在后牛顿(PN)展开中,我们将供后续全数值模拟使用的准圆轨道参数确定扩展至3.5PN阶,并发现这会带来比此前仅使用至3PN阶方法更低的偏心率e。我们还将由辐射反作用引起的径向落入以及质心位置的计算补充至3.5PN阶,并给出显式公式。此外,我们通过显式纳入Schwarzschild极限和Kerr极限来考虑小质量比极限,其中后者采用准各向同性坐标以及我们通常使用的ADMTT坐标。我们利用3PN、3.5PN、3.5PN+Schwarzschild、3.5PN+KerrQISO和3.5PN+KerrADMTT准圆数据,对质量比q=1/16的双星进行演化,涵盖三种不同构型,其中较大黑洞的内禀自旋为χ^z=-0.8、-0.4和+0.8。通过使用来自黑洞轨迹以及波形振幅和相位的不同偏心率度量,我们确定相对于3PN初始值,偏心率出现系统性降低,降低幅度最高可达一个数量级,并达到预期的e~10^-3阈值。

英文摘要:

In the post-Newtonian (PN) expansion, we extend the determination of quasicircular orbital parameters to be used by subsequent full numerical simulations to the 3.5PN order, and find that this leads to lower eccentricities, $e$, than with our previous method that used up to 3PN order. We also supplement the computation of the radial infall due to radiation reaction and the location of the center of mass to 3.5PN order, providing explicit formulas. In addition, we consider the small mass ratio limit by explicitly including the Schwarzschild and Kerr limits, the later in quasi-isotropic as well as in our standard use of ADMTT coordinates. We evolve binaries with a $q=1/16$ mass ratio by using 3PN, 3.5PN, 3.5PN+Schwarzschild, 3.5PN+KerrQISO and 3.5PN+KerrADMTT quasicircular data for three different configurations where the larger hole intrinsic spins are $χ^z=-0.8$, $-0.4$ and $+0.8$. Using different measures of eccentricity from the black hole trajectories and from the waveform amplitudes and phases, we determine a systematic reduction of eccentricities with respect to the 3PN initial values by factors of up to an order of magnitude, and reaching the desired $e\sim10^{-3}$ threshold.

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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