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arXiv 1012.2456gr-qcastro-ph.CO
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极值质量比极限下的二元黑洞合并:有效单体多极波形的检验和改进

Binary black hole coalescence in the extreme-mass-ratio limit: testing and improving the effective-one-body multipolar waveform

Sebastiano Bernuzzi, Alessandro Nagar, Anil Zenginoglu

摘要:

讨论了质量为$μ$和$M$的非自旋黑洞双星在极端质量比极限$μ/M=ν\ll 1$下发射的有效单体多极引力波的性质。我们把重点放在从准圆螺旋的过渡暴跌,合并和ringdown.We比较EOB波形的Regge-Wheeler-Zerilli(RWZ)波形计算使用双曲面层的方法,并提取在零无穷大。因为EOB波形在分析上跟踪早期螺旋中的大多数相位差,所以我们不允许波形之间的任何任意时间或相移。粒子的动力学,共同的波产生形式主义,是由领先的顺序${\cal O}(ν)$解析-图解辐射反应。EOB和RWZ波形具有约$5\times 10^{-4}$ rad的初始失相,然后在长螺旋($\sim 33$轨道)期间保持非常精确的相位相干性,直到最后的稳定轨道,即$Δϕ/ϕ\sim -5.95\times 10^{-6}$,仅积累约$-2\times 10^{-3}$ rad。我们获得这样的准确性,而无需校准的分析图解的EOB波形的数值数据,这表明倾向的EOB波形的ISA为导向的研究。然后,我们通过在引力波振幅和相位中引入和调整准圆修正来改善合并前后EOB波形的行为。对于每个多极子,我们调整只有四个下一个准圆形参数,要求EOB和RWZ波形之间的兼容性在光环。合并时间前后的相位差小至$\pm 0.015$ rad,分数振幅一致率为2.5%。这表明,旁边的准圆形修正的相位可以是一个有用的成分EOB和数值相对论波形之间的比较。

英文摘要:

We discuss the properties of the effective-one-body (EOB) multipolar gravitational waveform emitted by nonspinning black-hole binaries of masses $μ$ and $M$ in the extreme-mass-ratio limit, $μ/M=ν\ll 1$. We focus on the transition from quasicircular inspiral to plunge, merger and ringdown.We compare the EOB waveform to a Regge-Wheeler-Zerilli (RWZ) waveform computed using the hyperboloidal layer method and extracted at null infinity. Because the EOB waveform keeps track analytically of most phase differences in the early inspiral, we do not allow for any arbitrary time or phase shift between the waveforms. The dynamics of the particle, common to both wave-generation formalisms, is driven by leading-order ${\cal O}(ν)$ analytically--resummed radiation reaction. The EOB and the RWZ waveforms have an initial dephasing of about $5\times 10^{-4}$ rad and maintain then a remarkably accurate phase coherence during the long inspiral ($\sim 33$ orbits), accumulating only about $-2\times 10^{-3}$ rad until the last stable orbit, i.e. $Δϕ/ϕ\sim -5.95\times 10^{-6}$. We obtain such accuracy without calibrating the analytically-resummed EOB waveform to numerical data, which indicates the aptitude of the EOB waveform for LISA-oriented studies. We then improve the behavior of the EOB waveform around merger by introducing and tuning next-to-quasi-circular corrections both in the gravitational wave amplitude and phase. For each multipole we tune only four next-to-quasi-circular parameters by requiring compatibility between EOB and RWZ waveforms at the light-ring. The resulting phase difference around merger time is as small as $\pm 0.015$ rad, with a fractional amplitude agreement of 2.5%. This suggest that next-to-quasi-circular corrections to the phase can be a useful ingredient in comparisons between EOB and numerical relativity waveforms.

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