Abstract
Numerical Relativity has been of fundamental importance for studying compact binary coalescence dynamics, waveform modelling, and eventually for gravitational waves observations. As the sensitivity of the detector network improves, more precise template modelling will be necessary to guarantee a more accurate estimation of astrophysical parameters. To help improve the accuracy of numerical relativity catalogs, we developed a deep learning model capable of detecting anomalous waveforms. We analyzed 1341 binary black hole simulations from the SXS catalog with various mass-ratios and spins, considering waveform dominant and higher modes. In the set of waveform analyzed, we found and categorised seven types of anomalies appearing in the coalescence phases.
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Notes
In general the predicted waveform precision requirement for real events depends on the loudness of the signal, scaling as the inverse square of its signal-to-noise ratio. For current second generation detector [16] with signal-to-noise ratio \(\sim \textrm{few}\times 10\) a noise weighed “mismatch” of \(10^{-3}\) is usually required.
We restricted our analysis to the 1341 simulations with mass ratio \(q\le 4\) because beyond this value simulations become sparser, and this can jeopardize the learning process of the neural network model training.
To make it explict, we use the \((2,2),\,(2,1),\,(3,3),\,(3,2),\,(4,4),\,(4,3)\), i.e. 6 modes for each simulation in the catalog.
For all numerical waveforms we used the best resolution available in the repository.
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Acknowledgements
The authors thank the International Institute of Physics for hospitality and support during most of this work. We thank Michael Boyle, from the SXS team, for the valuable discussions. TP is supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)—Graduate Research Fellowship. The work of RS is partly supported by CNPq under Grant 310165/2021-0 and RS would like to thank ICTP-SAIFR FAPESP Grant No. 2016/01343-7. The authors thank the High Performance Computing Center (NPAD) at UFRN for providing the computational resources necessary for this work.
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Methodology: TP, RS; Software: TP; Data analyses: TP, RS; Writing original draft and preparation: TP, RS; Reviewing and editing: TP, RS.
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Riccardo Sturani reports financial support was provided by National Council for Scientific and Technological Development under Grant 310165/2021-0. Riccardo Sturani reports financial support was provided by ICTP South American Institute for Fundamental Research under Grant 2016/01343-7.
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Pereira, T., Sturani, R. Deep learning waveform anomaly detector for numerical relativity catalogs. Gen Relativ Gravit 56, 24 (2024). https://doi.org/10.1007/s10714-024-03216-w
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DOI: https://doi.org/10.1007/s10714-024-03216-w