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arXiv 1601.05396gr-qc
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对准自旋双星的二元黑洞波形模型的准确性

Accuracy of binary black hole waveform models for aligned-spin binaries

Prayush Kumar, Tony Chu, Heather Fong, Harald P. Pfeiffer, Michael Boyle, Daniel A. Hemberger, Lawrence E. Kidder, Mark A. Scheel, Bela Szilagyi

摘要:

合并的双黑洞是第二代地基引力波(GW)探测器的主要科学目标之一。可靠的GW模型是检测这样的系统和随后的参数估计的核心。利用一组新的$84$高精度数值相对论模拟,对最近的具有对齐自旋的双黑洞波形模型的准确性进行了全面的分析。我们的分析涵盖了可比质量的二进制文件($1\le m_1/m_2\le 3$),和样本独立的两个黑洞旋转到无量纲的自旋大小的$0.9$等质量的二进制文件和$0.85$不等质量的二进制文件。此外,我们专注于高质量的制度(总质量$\gtrsim 50M_\odot$)。考虑的两个最新的波形模型(PhenomD和SEOBNRv2)都表现得非常好的信号检测,损失小于0.5\%的可恢复的信噪比$ρ$,除了SEOBNRv2的效率下降温和的两个黑洞自旋与大幅度对齐。对于参数估计,SEOBNRv2的建模不准确性被发现是小于系统的不确定性,中等强度GW事件大致$ρ\lesssim 15$。发现PhenomD的建模误差小于SEOBNRv2的,并且通常与$ρ\lesssim 20$无关。两个模型的准确性随着质量比的增加而降低,并且当至少有一个黑洞自旋较大且对齐时。SEOBNRv2模型在合并阶段与数值相对论模拟显示出明显的不一致,因为质量不等,同时两个黑洞自旋非常大且对齐。发现两个较旧的波形模型(PhenomC和SEOBNRv1)明显不如最近的PhenomD和SEOBNRv2模型准确。最后,我们量化的偏差预计从所有GW模型在参数估计恢复二进制的质量和自旋。

英文摘要:

Coalescing binary black holes are among the primary science targets for second generation ground-based gravitational wave (GW) detectors. Reliable GW models are central to detection of such systems and subsequent parameter estimation. This paper performs a comprehensive analysis of the accuracy of recent waveform models for binary black holes with aligned spins, utilizing a new set of $84$ high-accuracy numerical relativity simulations. Our analysis covers comparable mass binaries ($1\le m_1/m_2\le 3$), and samples independently both black hole spins up to dimensionless spin-magnitude of $0.9$ for equal-mass binaries and $0.85$ for unequal mass binaries. Furthermore, we focus on the high-mass regime (total mass $\gtrsim 50M_\odot$). The two most recent waveform models considered (PhenomD and SEOBNRv2) both perform very well for signal detection, losing less than 0.5\% of the recoverable signal-to-noise ratio $ρ$, except that SEOBNRv2's efficiency drops mildly for both black hole spins aligned with large magnitude. For parameter estimation, modeling inaccuracies of SEOBNRv2 are found to be smaller than systematic uncertainties for moderately strong GW events up to roughly $ρ\lesssim 15$. PhenomD's modeling errors are found to be smaller than SEOBNRv2's, and are generally irrelevant for $ρ\lesssim 20$. Both models' accuracy deteriorates with increased mass-ratio, and when at least one black hole spin is large and aligned. The SEOBNRv2 model shows a pronounced disagreement with the numerical relativity simulation in the merger phase, for unequal masses and simultaneously both black hole spins very large and aligned. Two older waveform models (PhenomC and SEOBNRv1) are found to be distinctly less accurate than the more recent PhenomD and SEOBNRv2 models. Finally, we quantify the bias expected from all GW models during parameter estimation for recovery of binary's masses and spins.

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