Characterization of Gravitational-Wave Detector Noise with Fractals
We present a new method, based on fractal analysis, to characterize the output of a physical detector that is in the form of a set of real-valued, discrete physical measurements. We apply the method to gravitational-wave data from the latest observing run of the Laser Interferometer Gravitational-Wave Observatory. We show that a measure of the fractal dimension of the main detector output (strain channel) can be used to determine the instrument status, test data stationarity, and identify non-astrophysical excess noise in low latency. When applied to instrument control and environmental data (auxiliary channels) the fractal dimension can be used to identify the origins of noise transients, non-linear couplings in the various detector subsystems, and provide a means to flag stretches of low-quality data.
M. Cavaglià, "Characterization of Gravitational-Wave Detector Noise with Fractals," Classical and Quantum Gravity, vol. 39, no. 13, article no. 135012, IOP Publishing, Jul 2022.
The definitive version is available at https://doi.org/10.1088/1361-6382/ac7325
Keywords and Phrases
data analysis; fractal analysis; gravitational waves; LIGO
International Standard Serial Number (ISSN)
Article - Journal
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07 Jul 2022
National Science Foundation, Grant DMS-1925919