Targeted large mass ratio numerical relativity surrogate waveform model for GW190814
Targeted large mass ratio numerical relativity surrogate waveform model for GW190814
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DOI：
10.1103/physrevd.106.044001
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发表时间：
2022-03
影响因子：
5
通讯作者：
Jooheon Yoo;V. Varma;M. Giesler;M. Scheel;C. Haster;H. Pfeiffer;Lawrence E. Kidder;M. Boyle
中科院分区：
文献类型：
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作者：
Jooheon Yoo;V. Varma;M. Giesler;M. Scheel;C. Haster;H. Pfeiffer;Lawrence E. Kidder;M. Boyle
像GW 190814这样的大质量比紧凑双星合并的引力波观测突出了对此类系统可靠，高精度波形模板的需求。我们提出了NRHybSur 2dq 15，这是一个新的代理模型，在质量比q ≤ 15的混合数值相对论（NR）波形上训练，并对齐自旋|χ 1 z| ≤ 0。5和χ 2 z = 0。我们的目标是GW 190814类事件的参数空间，因为大质量比NR模拟非常昂贵。该模型包括（2，2）、（2，1）、（3，3）、（4，4）和（5，5）自旋加权球谐模，并且对于总质量M（cid：38）9跨越整个LIGO-Virgo带宽（f low = 20 Hz）。5 M（cid：12）。NRHybSur 2dq 15精确地再现了混合波形，总质量为10 M（cid：12）≤ M ≤ 300 M（cid：12）时，失配低于102 × 10 − 3。这至少是一个数量级的改进，现有的半分析模型GW 190814类系统。最后，我们重新分析GW 190814与新的模型，并获得源参数约束与以前的工作一致。
Gravitational wave observations of large mass ratio compact binary mergers like GW190814 highlight the need for reliable, high-accuracy waveform templates for such systems. We present NRHybSur2dq15 , a new surrogate model trained on hybridized numerical relativity (NR) waveforms with mass ratios q ≤ 15, and aligned spins | χ 1 z | ≤ 0 . 5 and χ 2 z = 0. We target the parameter space of GW190814-like events as large mass ratio NR simulations are very expensive. The model includes the (2,2), (2,1), (3,3), (4,4), and (5,5) spin-weighted spherical harmonic modes, and spans the entire LIGO-Virgo bandwidth (with f low = 20 Hz) for total masses M (cid:38) 9 . 5 M (cid:12) . NRHybSur2dq15 accurately reproduces the hybrid waveforms, with mismatches below ∼ 2 × 10 − 3 for total masses 10 M (cid:12) ≤ M ≤ 300 M (cid:12) . This is at least an order of magnitude improvement over existing semi-analytical models for GW190814-like systems. Finally, we reanalyze GW190814 with the new model and obtain source parameter constraints consistent with previous work.