Efficient GPU-Accelerated MultiSource Global Fit Pipeline for LISA Data Analysis

The large-scale analysis task of deciphering gravitational-wave signals in the LISA data stream will be difficult, requiring a large amount of computational resources and extensive development of computational methods. Its high dimensionality, multiple model types, and complicated noise profile requ...

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Veröffentlicht in:Physical review. D Jg. 111; H. 2
Hauptverfasser: Katz, Michael L, Karnesis, Nikolaos, Korsakova, Natalia, Gair, Jonathan, Stergioulas, Nikolaos
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Marshall Space Flight Center American Physical Society 24.01.2025
Schlagworte:
Astrophysics
Computer Programming and Software
Numerical Analysis
Data Analysis
Gpus
Lisa Global Fit
Lisa
ISSN:2470-0010, 2470-0029
Online-Zugang:Volltext
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Zusammenfassung:The large-scale analysis task of deciphering gravitational-wave signals in the LISA data stream will be difficult, requiring a large amount of computational resources and extensive development of computational methods. Its high dimensionality, multiple model types, and complicated noise profile require a global fit to all parameters and input models simultaneously. In this work, we detail our global fit algorithm, called “Erebor,” designed to accomplish this challenging task. It is capable of analyzing current state-of-the-art datasets and then growing into the future as more pieces of the pipeline are completed and added. We describe our pipeline strategy, the algorithmic setup, and the results from our analysis of the LDC2A Sangria dataset, which contains massive black hole binaries, compact galactic binaries, and a parametrized noise spectrum whose parameters are unknown to the user. The Erebor algorithm includes three unique and very useful contributions: GPU acceleration for enhanced computational efficiency; ensemble Markov Chain Monte Carlo (MCMC) sampling with multiple MCMC walkers per temperature for better mixing and parallelized sample creation; and special online updates to reversible-jump (or transdimensional) sampling distributions to ensure sampler mixing and accurate initial estimates for detectable sources in the data.We recover posterior distributions for all 15 (6) of the injected massive black hole binaries (MBHB) in the LDC2A training (hidden) dataset. We catalog ∼12000 galactic binaries (∼8000 as high confidence detections) for both the training and hidden datasets. All of the sources and their posterior distributions are provided in publicly available catalogs.
Bibliographie:Marshall Space Flight Center
MSFC
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.111.024060