Gravitational-wave detection using multivariate analysis

被引:12
作者
Adams, Thomas S. [1 ]
Meacher, Duncan [1 ,2 ]
Clark, James [1 ,3 ]
Sutton, Patrick J. [1 ]
Jones, Gareth [1 ]
Minot, Ariana [4 ]
机构
[1] Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, S Glam, Wales
[2] Univ Nice Sophia Antipolis, ARTEMIS, UMR7250, Observ Cote Azur,CNRS, F-06300 Nice, France
[3] Univ Massachusetts, Amherst, MA 01003 USA
[4] Harvard Univ, Cambridge, MA 02138 USA
来源
PHYSICAL REVIEW D | 2013年 / 88卷 / 06期
基金
美国国家科学基金会;
关键词
GAMMA-RAY BURSTS; SEARCH; ORIGIN;
D O I
10.1103/PhysRevD.88.062006
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Searches for gravitational-wave bursts (transient signals, typically of unknown waveform) require identification of weak signals in background detector noise. The sensitivity of such searches is often critically limited by non-Gaussian noise fluctuations that are difficult to distinguish from real signals, posing a key problem for transient gravitational-wave astronomy. Current noise rejection tests are based on the analysis of a relatively small number of measured properties of the candidate signal, typically correlations between detectors. Multivariate analysis (MVA) techniques probe the full space of measured properties of events in an attempt to maximize the power to accurately classify events as signal or background. This is done by taking samples of known background events and (simulated) signal events to train the MVA classifier, which can then be applied to classify events of unknown type. We apply the boosted decision tree (BDT) MVA technique to the problem of detecting gravitational-wave bursts associated with gamma-ray bursts. We find that BDTs are able to increase the sensitive distance reach of the search by as much as 50%, corresponding to a factor of similar to 3 increase in sensitive volume. This improvement is robust against trigger sky position, large sky localization error, poor data quality, and the simulated signal waveforms that are used. Critically, we find that the BDT analysis is able to detect signals that have different morphologies from those used in the classifier training and that this improvement extends to false alarm probabilities beyond the 3 sigma significance level. These findings indicate that MVA techniques may be used for the robust detection of gravitational-wave bursts with a priori unknown waveform.
引用
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页数:13
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