High-accuracy high-mass-ratio simulations for binary neutron stars and their comparison to existing waveform models
High-accuracy high-mass-ratio simulations for binary neutron stars and their comparison to existing waveform models
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DOI：
10.1103/physrevd.106.023029
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发表时间：
2022-02
影响因子：
5
通讯作者：
M. Ujevic;A. Rashti;H. Gieg;W. Tichy;T. Dietrich
中科院分区：
文献类型：
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作者：
M. Ujevic;A. Rashti;H. Gieg;W. Tichy;T. Dietrich
先进的引力波探测器网络随后的观测运行将很可能为我们提供对双中子星系统的各种引力波观测。为了准确解释这些探测，我们需要可靠的引力波模型。为了测试和指出如何改进现有的模型，我们对四个不同的物理装置进行了一组高分辨率的数值相对论模拟，质量比$Q$=$1.25$，$1.50$，$1.75$，$2.00$，以及总引力质量$M=2.7M_\ODOT$。每种配置都用五种不同的分辨率进行模拟，以便进行适当的误差评估。总体而言，我们发现对于主要的$(2，2)$，以及次要的$(2，1)$，$(3，3)$，$(4，4)$，我们得到了大约二阶收敛结果，而一般来说，随着质量比的增加，收敛阶略有降低。我们的模拟使我们能够验证波形模型，我们发现最先进的模型和我们的数据总体上符合得很好，并证明了目前用于二元黑洞波形建模的高阶模式的标度关系也适用于潮汐贡献。最后，我们还检验了目前用于描述潮汐效应的NRTdal模型是否适用于高质量比系统。我们希望我们的模拟结果可以用来进一步改进和检验波形模型，为下一次的观测运行做准备。
The subsequent observing runs of the advanced gravitational-wave detector network will likely provide us with various gravitational-wave observations of binary neutron star systems. For an accurate interpretation of these detections, we need reliable gravitational-wave models. To test and to point out how existing models could be improved, we perform a set of high-resolution numerical-relativity simulations for four different physical setups with mass ratios $q$ = $1.25$, $1.50$, $1.75$, $2.00$, and total gravitational mass $M = 2.7M_\odot$ . Each configuration is simulated with five different resolutions to allow a proper error assessment. Overall, we find approximately 2nd order converging results for the dominant $(2,2)$, but also subdominant $(2,1)$, $(3,3)$, $(4,4)$ modes, while, generally, the convergence order reduces slightly for an increasing mass ratio. Our simulations allow us to validate waveform models, where we find generally good agreement between state-of-the-art models and our data, and to prove that scaling relations for higher modes currently employed for binary black hole waveform modeling also apply for the tidal contribution. Finally, we also test if the current NRTidal model to describe tidal effects is a valid description for high-mass ratio systems. We hope that our simulation results can be used to further improve and test waveform models in preparation for the next observing runs.