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arXiv 1602.03081gr-qc
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偏心轨道可比质量致密双星的频域和时域内旋模板

Frequency and time domain inspiral templates for comparable mass compact binaries in eccentric orbits

Sashwat Tanay, Maria Haney, Achamveedu Gopakumar

摘要:

具有不可忽略的轨道偏心率的螺旋形紧凑双星是即将到来的GW观测站网络的引力波(GW)源。在本文中,我们提出了两个处方计算后牛顿(PN)准确的inspiral模板,这样的二进制文件。首先,我们对Yunes { \it et al.} [Phys.Rev.D80,084001(2009)]中的方法,以获得包含PN精确轨道偏心率演化的影响的傅立叶域内旋近似。这导致在一个完全解析的频域inspiral波形与牛顿振幅和2 PN阶傅立叶相位,同时将偏心效应高达六阶在每个PN阶。将偏心演化贡献的傅立叶相位在PN一致的方式的重要性也被证明。其次,我们提出了一个准确和有效的处方,将轨道偏心率的准圆时域{ \texttt{TaylorT4} }近似在2 PN阶。新的功能包括使用合理的功能,在轨道偏心率,以实现1.5PN阶尾部的贡献,远区通量。这导致了封闭形式的PN精确微分方程的演变偏心轨道和由此产生的时域近似是准确和有效的处理初始轨道偏心$\leq 0.9$。初步GW数据分析的影响,探讨使用匹配估计。

英文摘要:

Inspiraling compact binaries with non-negligible orbital eccentricities are plausible gravitational wave (GW) sources for the upcoming network of GW observatories. In this paper, we present two prescriptions to compute post-Newtonian (PN) accurate inspiral templates for such binaries. First, we adapt and extend the post-circular scheme of Yunes {\it et al.} [Phys. Rev. D 80, 084001 (2009)] to obtain a Fourier-domain inspiral approximant that incorporates the effects of PN-accurate orbital eccentricity evolution. This results in a fully analytic frequency-domain inspiral waveform with Newtonian amplitude and 2PN order Fourier phase while incorporating eccentricity effects up to sixth order at each PN order. The importance of incorporating eccentricity evolution contributions to the Fourier phase in a PN consistent manner is also demonstrated. Second, we present an accurate and efficient prescription to incorporate orbital eccentricity into the quasi-circular time-domain {\texttt{TaylorT4}} approximant at 2PN order. New features include the use of rational functions in orbital eccentricity to implement the 1.5PN order tail contributions to the far-zone fluxes. This leads to closed form PN-accurate differential equations for evolving eccentric orbits and the resulting time-domain approximant is accurate and efficient to handle initial orbital eccentricities $\leq 0.9$. Preliminary GW data analysis implications are probed using match estimates.

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