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arXiv 1012.5860gr-qc
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引力自作用力的快速频域算法:I,Schwarzschild时空中的圆轨道

A Fast Frequency-Domain Algorithm for Gravitational Self-Force: I, Circular Orbits in Schwarzschild Spacetime

Sarp Akcay

摘要:

大质量黑洞周围致密物体的快速、可靠的轨道演变将需要作为引力波搜索算法的输入,搜索算法由计划中的激光干涉仪空间天线(LISA)产生。目前,现有技术是[Phys. Rev. D{ \bf 81},084021,(2010)]的时域代码,其计算围绕史瓦西黑洞的偏心轨道中的点粒子上的引力自作用力。目前,时域码需要几天时间来计算参数空间中的一个点。在一系列文章中,我们提倡使用频域方法来解决引力自作用力(GSF)问题,并牢记轨道演化的最终目标。在这里,我们计算粒子在史瓦西时空中的圆形轨道上的GSF。我们求解了洛伦兹规范中度规微扰的线性化爱因斯坦方程。我们的频域代码再现的GSF的时域结果高达$\sim 1000$倍更快的小轨道半径。在即将发表的姊妹论文中,我们将推广我们的频域方法,以包括史瓦西和(最终)克尔时空中的束缚(偏心)轨道来计算GSF,其中我们将采用扩展齐次解的方法[Phys. Rev. D { \bf 78},084021(2008)]。

英文摘要:

Fast, reliable orbital evolutions of compact objects around massive black holes will be needed as input for gravitational wave search algorithms in the data stream generated by the planned Laser Interferometer Space Antenna (LISA). Currently, the state of the art is a time-domain code by [Phys. Rev. D{\bf 81}, 084021, (2010)] that computes the gravitational self-force on a point-particle in an eccentric orbit around a Schwarzschild black hole. Currently, time-domain codes take up to a few days to compute just one point in parameter space. In a series of articles, we advocate the use of a frequency-domain approach to the problem of gravitational self-force (GSF) with the ultimate goal of orbital evolution in mind. Here, we compute the GSF for a particle in a circular orbit in Schwarzschild spacetime. We solve the linearized Einstein equations for the metric perturbation in Lorenz gauge. Our frequency-domain code reproduces the time-domain results for the GSF up to $\sim 1000$ times faster for small orbital radii. In forthcoming companion papers, we will generalize our frequency-domain methods to include bound (eccentric) orbits in Schwarzschild and (eventually) Kerr spacetimes for computing the GSF, where we will employ the method of extended homogeneous solutions [Phys. Rev. D {\bf 78}, 084021 (2008)].

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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