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arXiv 1010.5255gr-qcastro-ph.HE
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通过m模正则化和2+ 1维演化的自作用力:Schwarzschild上的基础和标量场实现

Self force via m-mode regularization and 2+1D evolution: Foundations and a scalar-field implementation on Schwarzschild

Sam R. Dolan, Leor Barack

摘要:

为了模拟极端质量比的双螺旋(LISA任务的关键目标)的辐射演化,该社区需要有效的方法来计算克尔时空上的引力自作用力(SF)。在这里,我们进一步开发了一个实用的“$m$模式正则化”计划SF计算,并给出第一个实施的细节。该方法的关键步骤是(i)用适当的“穿刺”去除扰动场的奇异部分,以在围绕粒子世界线的有限世界管内留下足够规则的残差,(ii)在方位角上分解,($m$ -)模式,(iii)用有限差分格式在2+1D中的$m$ -模式的数值演化,以及(iv)从模和重构SF。该方法依赖于一个明智的选择穿刺,基于Detweiler-Whiting分解。我们给出了一个工作定义的“秩序”的穿刺,并显示它如何确定的收敛速度的$m$模式和。SF的耗散部分显示指数收敛的模式和,而保守部分的$m$模式和收敛于幂律。在后一种情况下,个体模态贡献在大$m$处下降,对于偶数$n$为$m^{-n}$,对于奇数$n$为$m^{-n+1}$,其中$n$是穿孔顺序。我们描述了一个$m$模式的实现与四阶穿刺计算沿圆测地线上史瓦西的标量场SF。在即将发表的姊妹论文中,我们将计算扩展到克尔时空。

英文摘要:

To model the radiative evolution of extreme mass-ratio binary inspirals (a key target of the LISA mission), the community needs efficient methods for computation of the gravitational self-force (SF) on the Kerr spacetime. Here we further develop a practical `$m$-mode regularization' scheme for SF calculations, and give details of a first implementation. The key steps in the method are (i) removal of a singular part of the perturbation field with a suitable `puncture' to leave a sufficiently regular residual within a finite worldtube surrounding the particle's worldline, (ii) decomposition in azimuthal ($m$-)modes, (iii) numerical evolution of the $m$-modes in 2+1D with a finite difference scheme, and (iv) reconstruction of the SF from the mode sum. The method relies on a judicious choice of puncture, based on the Detweiler--Whiting decomposition. We give a working definition for the `order' of the puncture, and show how it determines the convergence rate of the $m$-mode sum. The dissipative piece of the SF displays an exponentially convergent mode sum, while the $m$-mode sum for the conservative piece converges with a power law. In the latter case the individual modal contributions fall off at large $m$ as $m^{-n}$ for even $n$ and as $m^{-n+1}$ for odd $n$, where $n$ is the puncture order. We describe an $m$-mode implementation with a 4th-order puncture to compute the scalar-field SF along circular geodesics on Schwarzschild. In a forthcoming companion paper we extend the calculation to the Kerr spacetime.

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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