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arXiv 2102.08614gr-qc
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基于有效单体数值相对论的偏心双星黑洞的高多极引力波模型

A higher-multipole gravitational waveform model for an eccentric binary black holes based on the effective-one-body-numerical-relativity formalism

Xiaolin Liu, Zhoujian Cao, Zong-Hong Zhu

摘要:

基于有效单体(EOB)理论,我们构造了一个新的包含$(l,|m|)=(2,2),(2,1),(3,3),(4,4)$模的因式分解波形,它适用于一般赤道轨道上的自旋双黑洞(BBH)。当与$\texttt{SEOBNRv4}$的动力学相结合时,在准圆形轨道的情况下,由该新波形产生的$(l,|m|)=(2,2)$模式波形可以非常好地拟合原始$\texttt{SEOBNRv4}$波形。我们已经校准了我们的新波形模型,以模拟极端时空(SXS)目录。使用Advanced LIGO设计的灵敏度,对BBH与$(20,200)M_\odot$中的总质量进行比较。对于准圆的情况下,我们比较了我们的$(2,2)$模式波形的281数值相对论(NR)模拟的BBH沿准圆轨道。匹配系数均大于98%。对于椭圆情形,我们使用了24个数值相对论模拟沿椭圆轨道的BBH。对于每一个椭圆BBH系统,我们比较我们的建模重力极化对NR结果的倾角,初始轨道相位和源定位在天空中的不同组合。我们使用最小匹配因子相对于倾角,初始轨道相位和源定位来量化的性能的高次模式波形。我们发现,在引入高次模后,24个椭圆边带隙中最小匹配因子的最小值从90%增加到98%。根据我们以前的$\texttt{SEOBNRE}$波形模型,我们将新的波形模型称为$\texttt{SEOBNREHM}$。我们的$\texttt{SEOBNREHM}$波形模型可以匹配所有测试的305 SXS波形优于98%,包括高自旋($χ=0.99$)BBH,高偏心($e\approx0.15$)BBH和大质量比($q=10$)BBH。

英文摘要:

We construct a new factorized waveform including $(l,|m|)=(2,2),(2,1),(3,3),(4,4)$ modes based on effective-one-body (EOB) formalism, which is valid for spinning binary black holes (BBH) in general equatorial orbit. When combined with the dynamics of $\texttt{SEOBNRv4}$, the $(l,|m|)=(2,2)$ mode waveform generated by this new waveform can fit the original $\texttt{SEOBNRv4}$ waveform very well in the case of a quasi-circular orbit. We have calibrated our new waveform model to the Simulating eXtreme Spacetimes (SXS) catalog. The comparison is done for BBH with total mass in $(20,200)M_\odot$ using Advanced LIGO designed sensitivity. For the quasi-circular cases we have compared our $(2,2)$ mode waveforms to the 281 numerical relativity (NR) simulations of BBH along quasi-circular orbits. All of the matching factors are bigger than 98\%. For the elliptical cases, 24 numerical relativity simulations of BBH along an elliptic orbit are used. For each elliptical BBH system, we compare our modeled gravitational polarizations against the NR results for different combinations of the inclination angle, the initial orbit phase and the source localization in the sky. We use the the minimal matching factor respect to the inclination angle, the initial orbit phase and the source localization to quantify the performance of the higher modes waveform. We found that after introducing the high modes, the minimum of the minimal matching factor among the 24 tested elliptical BBHs increases from 90\% to 98\%. Following our previous $\texttt{SEOBNRE}$ waveform model, we call our new waveform model $\texttt{SEOBNREHM}$. Our $\texttt{SEOBNREHM}$ waveform model can match all tested 305 SXS waveforms better than 98\% including highly spinning ($χ=0.99$) BBH, highly eccentric ($e\approx0.15$) BBH and large mass ratio ($q=10$) BBH.

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