High-time resolution search for compact objects using fast radio burst gravitational lens interferometry with CHIME/FRB
High-time resolution search for compact objects using fast radio burst gravitational lens interferometry with CHIME/FRB
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DOI：
10.1103/physrevd.106.043016
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发表时间：
2022-04
影响因子：
5
通讯作者：
Zarif Kader;C. Leung;M. Dobbs;K. Masui;D. Michilli;J. Mena-Parra;R. Mckinven;C. Ng;K. Bandura;M. Bhardwaj;C. Brar;T. Cassanelli;P. Chawla;F. Dong;D. Good;V. Kaspi;A. Lanman;Hsiu-Hsien Lin;B. W. Meyers;A. Pearlman;U. Pen;E. Petroff;Z. Pleunis;M. Rafiei-Ravandi;Mubdi Rahman;P. Sanghavi;P. Scholz;K. Shin;S. Siegel;Kendrick M. Smith;I. Stairs;S. Tendulkar;K. Vanderlinde;D. Wulf
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文献类型：
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作者：
Zarif Kader;C. Leung;M. Dobbs;K. Masui;D. Michilli;J. Mena-Parra;R. Mckinven;C. Ng;K. Bandura;M. Bhardwaj;C. Brar;T. Cassanelli;P. Chawla;F. Dong;D. Good;V. Kaspi;A. Lanman;Hsiu-Hsien Lin;B. W. Meyers;A. Pearlman;U. Pen;E. Petroff;Z. Pleunis;M. Rafiei-Ravandi;Mubdi Rahman;P. Sanghavi;P. Scholz;K. Shin;S. Siegel;Kendrick M. Smith;I. Stairs;S. Tendulkar;K. Vanderlinde;D. Wulf
致密物体的引力场，如原始黑洞，可以产生多个背景源的图像。对于诸如快速无线电突发（FRB）之类的瞬变，可以在时域中解析这些多个图像。在某些情况下，这些图像不仅具有相似的突发形态，而且在电场水平上是相位相干的。利用一种新的去通道化算法和匹配滤波技术，我们在加拿大氢测绘强度实验（CHIME）的FRB后端检测到的FRB观测中搜索相同电场波形的重复副本。来自相干引力透镜信号的干涉条纹将在时间滞后域中作为时间滞后自相关函数中的显著峰值出现。我们使用不含FRB信号的望远镜数据校准我们的统计显著性。我们的数据集由172个FRB事件的100 ms长的电压数据记录组成，去通道化到1.25 ns的时间分辨率。这种相干搜索算法使我们能够搜索质量范围为10 − 4 − 10 4 M的致密天体的引力透镜特征。在排除了由于散射闪烁引起的异常候选者之后，我们在已经分析的172个FRB事件中没有发现引力透镜的显著检测。在一个同伴的工作[1]中，我们解释了暗物质的约束，从这个搜索。
The gravitational field of compact objects, such as primordial black holes, can create multiple images of background sources. For transients such as fast radio bursts (FRBs), these multiple images can be resolved in the time domain. Under certain circumstances, these images not only have similar burst morphologies but are also phase-coherent at the electric field level. With a novel dechannelization algorithm and a matched filtering technique, we search for repeated copies of the same electric field waveform in observations of FRBs detected by the FRB backend of the Canadian Hydrogen Mapping Intensity Experiment (CHIME). An interference fringe from a coherent gravitational lensing signal will appear in the time-lag domain as a statistically-significant peak in the time-lag autocorrelation function. We calibrate our statistical significance using telescope data containing no FRB signal. Our dataset consists of ∼ 100-ms long recordings of voltage data from 172 FRB events, dechannelized to 1.25-ns time resolution. This coherent search algorithm allows us to search for gravitational lensing signatures from compact objects in the mass range of 10 − 4 − 10 4 M (cid:12) . After ruling out an anomalous candidate due to diffractive scintillation, we find no significant detections of gravitational lensing in the 172 FRB events that have been analyzed. In a companion work [1], we interpret the constraints on dark matter from this search.