Extraction of binary neutron star gravitational wave waveforms from Einstein Telescope using deep learning

TL;DR

This paper introduces a novel deep learning framework for extracting binary neutron star gravitational waveforms from Einstein Telescope data, addressing challenges in waveform reconstruction during different BNS phases.

Contribution

It presents the first application of deep learning for BNS waveform extraction, including specialized denoising models and an amplitude regularity model for improved waveform reconstruction.

Findings

Denoising models effectively recover BNS waveforms from noisy data.

The amplitude regularity model improves waveform shape regulation.

Overall method shows promising results for early warning and localization of BNS GWs.

Abstract

In the future, the third generation (3G) gravitational wave (GW) detectors, exemplified by the Einstein Telescope (ET), will be operational. The detection rate of GW from binary neutron star (BNS) is expected to reach approximately $10^4$ per year. To address the challenges posed by BNS GW data processing for 3G GW detectors, this paper explores the extraction of BNS waveforms from ET. Drawing inspiration from SPIIR's matched filtering approach, we introduce a novel framework leveraging deep learning for BNS waveform extraction. By integrating denoised outputs of time-delayed strain, we can reconstruct the embedded BNS waveform. We have established three distinct BNS GW denoising models, each tailored to address the early inspiral, later inspiral, and merger phases of BNS GW, respectively. To further regulate the waveform shape, we propose the Amplitude Regularity Model that takes denoised output as input and regulated waveform as output. The experiments conducted on test data demonstrate the efficacy of the denoising models, the Amplitude Regularity Models, as well as the overall waveform construction method. To the best of our knowledge, this marks the first instance of deep learning being utilized for the task of BNS waveform extraction. We believe that the proposed method holds promise for early warning, searching, and localization of BNS GWs.