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Real-time gravitational-wave science with neural posterior estimation

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arxiv 2106.12594 v2 pith:3PLXW6HT submitted 2021-06-23 gr-qc astro-ph.IMcs.LG

Real-time gravitational-wave science with neural posterior estimation

classification gr-qc astro-ph.IMcs.LG
keywords gravitational-waveeventinferencedataaccuracyestimationeventsnetworks
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We demonstrate unprecedented accuracy for rapid gravitational-wave parameter estimation with deep learning. Using neural networks as surrogates for Bayesian posterior distributions, we analyze eight gravitational-wave events from the first LIGO-Virgo Gravitational-Wave Transient Catalog and find very close quantitative agreement with standard inference codes, but with inference times reduced from O(day) to a minute per event. Our networks are trained using simulated data, including an estimate of the detector-noise characteristics near the event. This encodes the signal and noise models within millions of neural-network parameters, and enables inference for any observed data consistent with the training distribution, accounting for noise nonstationarity from event to event. Our algorithm -- called "DINGO" -- sets a new standard in fast-and-accurate inference of physical parameters of detected gravitational-wave events, which should enable real-time data analysis without sacrificing accuracy.

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