论文标题
GW190814的目标大质量比值相对性替代波形模型
Targeted large mass ratio numerical relativity surrogate waveform model for GW190814
论文作者
论文摘要
GW190814（GW190814）对大质量比率紧凑型二进制合并的重力波观测突出了对此类系统的可靠，高准确波形模板的需求。我们提出了NRHYBSUR2DQ15，这是一种新的替代模型，该模型在杂交数值相对论（NR）波形上具有质量比$ q \ leq15 $，并对齐的旋转$ |χ_{1Z} | \ leq leq0.5 $和$ c____________________ {2z} = 0 $。我们以GW190814样事件的参数空间为目标，因为较大的质量比NR模拟非常昂贵。该模型包括（2,2），（2,1），（3,3），（4,4）和（5,5）自旋加权球形谐波模式，并跨越整个Ligo带宽（用$ f _ {\ m atrm {\ mathrm {low}} = 20 $ hz），总质量为$ m \ gtrsim $ \ gtrsim 9.5.5 \; NRHYBSUR2DQ15准确地重现混合波形，不匹配$ \ sim 2 \ times 10^{ - 3} $的总质量$ 10 \，m _ {\ odot} \ leq m \ leq m \ leq m \ leq 300 \，m _ _ {\ odot} $。这至少是GW190814样系统的现有半分析模型的数量级改进。最后，我们使用新模型将GW190814重新分析，并获得与先前工作一致的源参数约束。
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 $q\leq15$, and aligned spins $|χ_{1z}|\leq0.5$ and $χ_{2z}=0$. 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 bandwidth (with $f_{\mathrm{low}}=20$ Hz) for total masses $M \gtrsim 9.5 \, M_{\odot}$. NRHybSur2dq15 accurately reproduces the hybrid waveforms, with mismatches below $\sim 2 \times 10^{-3}$ for total masses $10 \, M_{\odot} \leq M \leq 300 \, M_{\odot}$. 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.
