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arXiv 1004.5322gr-qcastro-ph.HE
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准偏心轨道自旋致密双星的波形计算

Computing waveforms for spinning compact binaries in quasi-eccentric orbits

Neil J. Cornish, Joey Shapiro Key

摘要:

已经提出了几种方案,其中双黑洞的轨道进入引力波探测器的带具有显着的偏心率。为了避免错过这些信号或偏置参数估计,重要的是,我们考虑考虑偏心率的波形模型。计算自旋黑洞在准偏心轨道上螺旋运动所产生的后牛顿(PN)波形所需的成分已经在2 PN阶上存在了近20年,最近这项工作已经扩展到2.5 PN阶。然而,直接实现这些波形的计算成本很高,需要每个轨道许多步骤来演化耦合微分方程系统。在这里,我们采用的标准技术的分离的时间尺度和广义开普勒参数化的轨道产生有效的波形描述自旋黑洞二进制与任意质量和自旋准偏心轨道上的1.5 PN顺序。我们分离的快速轨道的时间尺度从缓慢的自旋-轨道进动的时间尺度,通过解决轨道运动在一个非内部的参考框架,遵循轨道进动。我们概述了一个计划,将我们的方法扩展到更高的后牛顿秩序。

英文摘要:

Several scenarios have been proposed in which the orbits of binary black holes enter the band of a gravitational wave detector with significant eccentricity. To avoid missing these signals or biasing parameter estimation it is important that we consider waveform models that account for eccentricity. The ingredients needed to compute post-Newtonian (PN) waveforms produced by spinning black holes inspiralling on quasi-eccentric orbits have been available for almost two decades at 2 PN order, and this work has recently been extended to 2.5 PN order. However, the computational cost of directly implementing these waveforms is high, requiring many steps per orbit to evolve the system of coupled differential equations. Here we employ the standard techniques of a separation of timescales and a generalized Keplerian parameterization of the orbits to produce efficient waveforms describing spinning black hole binaries with arbitrary masses and spins on quasi-eccentric orbits to 1.5 PN order. We separate the fast orbital timescale from the slow spin-orbit precession timescale by solving for the orbital motion in a non-interial frame of reference that follows the orbital precession. We outline a scheme for extending our approach to higher post-Newtonian order.

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