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arXiv 1806.08792astro-ph.IMgr-qc
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引力波参数估计的相对分箱和快速似然估计

Relative Binning and Fast Likelihood Evaluation for Gravitational Wave Parameter Estimation

Barak Zackay, Liang Dai, Tejaswi Venumadhav

摘要:

提出了一种加速引力波参数估计中似然估计的方法。参数估计代码计算相似波形的似然度,其相位和幅度随频率平滑地变化。我们利用这一点,通过预先计算的最佳拟合波形与数据的频率分箱重叠。我们展示了如何使用这些汇总数据来近似任何波形的可能性,这些波形在所需的精度内是足够可能的。我们证明,$\simeq 60$箱足以准确地计算在周围的二进制中子星合并GW 170817的采样率为$4096\,$ Hz和持续时间为$T=2048\,$ s的应变数据的似然性。相对分箱与朴素匹配滤波相比以$\sim 10^4$的因子加速频域波形模型的参数估计,与降阶正交相比以$\sim 10$的因子加速频域波形模型的参数估计。

英文摘要:

We present a method to accelerate the evaluation of the likelihood in gravitational wave parameter estimation. Parameter estimation codes compute likelihoods of similar waveforms, whose phases and amplitudes differ smoothly with frequency. We exploit this by precomputing frequency-binned overlaps of the best-fit waveform with the data. We show how these summary data can be used to approximate the likelihood of any waveform that is sufficiently probable within the required accuracy. We demonstrate that $\simeq 60$ bins suffice to accurately compute likelihoods for strain data at a sampling rate of $4096\,$Hz and duration of $T=2048\,$s around the binary neutron star merger GW170817. Relative binning speeds up parameter estimation for frequency domain waveform models by a factor of $\sim 10^4$ compared to naive matched filtering and $\sim 10$ compared to reduced order quadrature.

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