2024/10/14 by J. Kume, Kume, Jun'ya, Marco Peloso +5 · 3 citations
Earth and Planetary Sciences · Engineering · #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Geophysical Methods and Applications #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Seismic Imaging and Inversion Techniques #Seismic Waves and Analysis
paper · pdf · doi:10.48550/arxiv.2410.10342
openalex publication_date 2024/10/14 · openalex created_date 2025/06/19 · openalex updated_date 2026/07/28
In the search for stochastic gravitational wave backgrounds (SGWB) of cosmological origin with LISA, it is crucial to account for realistic complications in the noise and astrophysical foreground modeling that may impact the signal reconstruction. To address these challenges, we updated the SGWBinner code to incorporate both variable noise levels across LISA arms and more complex foreground spectral shapes. Our findings suggest that, while moderate variations of the noise amplitudes have a minimal impact, poor foreground modeling (i.e., templates requiring many free parameters) significantly degrades the reconstruction of cosmological signals. This underlines the importance of accurate modeling and subtraction of the astrophysical foregrounds to characterize possible cosmological components. To perform this more challenging analysis, we have integrated the JAX framework, which significantly improves the computational efficiency of the code, in the SGWBinner code, enabling faster Bayesian likelihood sampling and more effective exploration of complex SGWB signals.