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arXiv 0711.2628gr-qc
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连续一体重力波形与精确数值数据的比较

Comparing Effective-One-Body gravitational waveforms to accurate numerical data

Thibault Damour, Alessandro Nagar

摘要:

我们继续在连续一体(EOB)方法,高精度,忠实的解析波形描述的引力波信号所发出的吸入和合并的二元黑洞(BH)的建设,内的程序。我们提出了一个新的,图形化的3 PN-准确的EOB四极波形最近推出的小质量比限制的比较质量的版本。我们比较了这个波形的相位和振幅最近发表的结果的高精度数值相对论(NR)模拟的15个轨道的吸气等质量的二进制BH系统由加州理工学院-康奈尔大学集团进行。我们发现一个显着的协议,无论是在相位和振幅,新的EOB波形和公布的数值数据之间。更准确地说:(i)在引力波(GW)频域$Mω<0.08$中,其中一个非线性"泰勒近似“(T4)波形的相位与数值相对论波形的相位匹配良好,我们发现EOB相位也很好,而(ii)对于更高的GW频率,$0.08<Mω\lesssim 0.14$,其中泰勒T4近似开始明显偏离NR相位,我们表明,EOB阶段继续匹配以及NR的。我们进一步提出了各种方法调整的两个inspiral的灵活性参数,$a_5$和$v_{\rm pole}$,EOB波形,以便“最适合”的EOB预测数值数据。我们发现,EOB和NR之间的最大失相,然后可以减少到低于$10^{-3}$ GW周期在整个跨度(30 GW周期)的模拟。我们的图解EOB振幅同意更好地与NR一个比任何以前考虑的非图解,后牛顿。

英文摘要:

We continue the program of constructing, within the Effective-One-Body (EOB) approach, high accuracy, faithful analytic waveforms describing the gravitational wave signal emitted by inspiralling and coalescing binary black holes (BHs). We present the comparable-mass version of a new, resummed 3PN-accurate EOB quadrupolar waveform recently introduced in the small-mass-ratio limit. We compare the phase and the amplitude of this waveform to the recently published results of a high-accuracy numerical relativity (NR) simulation of 15 orbits of an inspiralling equal-mass binary BHs system performed by the Caltech-Cornell group. We find a remarkable agreement, both in phase and in amplitude, between the new EOB waveform and the published numerical data. More precisely: (i) in the gravitational wave (GW) frequency domain $Mω<0.08$ where the phase of one of the non-resummed ``Taylor approximant'' (T4) waveform matches well with the numerical relativity one, we find that the EOB phase fares as well, while (ii) for higher GW frequencies, $0.08<Mω\lesssim 0.14$, where the TaylorT4 approximant starts to significantly diverge from the NR phase, we show that the EOB phase continues to match well the NR one. We further propose various methods of tuning the two inspiral flexibility parameters, $a_5$ and $v_{\rm pole}$, of the EOB waveform so as to ``best fit'' EOB predictions to numerical data. We find that the maximal dephasing between EOB and NR can then be reduced below $10^{-3}$ GW cycles over the entire span (30 GW cycles) of the simulation. Our resummed EOB amplitude agrees much better with the NR one than any of the previously considered non-resummed, post-Newtonian one.

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