Targeted subthreshold search for strongly lensed gravitational-wave events
Targeted subthreshold search for strongly lensed gravitational-wave events
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DOI：
10.1103/physrevd.107.123014
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发表时间：
2019-04
影响因子：
5
通讯作者：
A. Li;R. K. Lo;S. Sachdev;J. Chan;E. Lin;T. Li;A. Weinstein
中科院分区：
文献类型：
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作者：
A. Li;R. K. Lo;S. Sachdev;J. Chan;E. Lin;T. Li;A. Weinstein
引力波的强引力透镜可以产生在时间上分离的具有不同振幅的重复信号。我们考虑的情况下，强透镜产生可识别的引力波事件与较弱的亚阈值信号，隐藏在噪声背景。我们提出了一种搜索方法的亚阈值信号使用减少模板银行针对特定确认的引力波事件。我们将该方法应用于Advanced LIGO的第一次观测运行O 1，GW 150914的事件。我们表明，该方法是有效的，在减少噪声背景，从而提高（近）亚阈值触发的意义。对GW 150914的敏感距离可提高4.5%~ 11.9%。最后，我们提出了GW 150914的可能的透镜候选者，其通过了我们的假警报率$\leq 1/30 \text{ days}$的标称显著性阈值。
Strong gravitational lensing of gravitational waves can produce duplicate signals that are separated in time with different amplitudes. We consider the case in which strong lensing produces identifiable gravitational-wave events together with weaker sub-threshold signals that are hidden in the noise background. We present a search method for the sub-threshold signals using reduced template banks targeting specific confirmed gravitational-wave events. We apply the method to an event from Advanced LIGO's first observing run O1, GW150914. We show that the method is effective in reducing the noise background and hence raising the significance of (near-) sub-threshold triggers. In the case of GW150914, we are able to improve the sensitive distance by $4.5\% - 11.9\%$. Finally, we present the possible lensed candidates for GW150914 which passed our nominal significance threshold of False-Alarm-Rate $\leq 1/30 \text{ days}$.