Accelerating the standard siren method: Improved constraints on modified gravitational-wave propagation with future data

Abstract

Gravitational waves (GWs) from compact binary mergers have emerged as one of the most promising probes of cosmology and General Relativity (GR). However, a major challenge in fully exploiting GWs as standard sirens with current and future GW observatories is developing efficient and robust codes capable of analyzing the increasing data volumes that are, and will be, acquired. We present here CHIMERA 2.0, an advanced computational framework for hierarchical Bayesian inference of cosmological, modified gravity, and population hyperparameters using standard sirens and galaxy catalogs. This upgrade introduces novel GPU-accelerated algorithms to estimate the hierarchical likelihood, enabling the analysis of thousands of events - crucial for next-generation experiments - and includes the two-parameter (${\Xi }_0-n$) modified GW propagation model. Using CHIMERA 2.0, we forecast cosmological and modified GW propagation constraints for the future LIGO-Virgo-KAGRA O5-like run. We analyze three binary black hole populations of 300 events at SNR>20, each with a different value of ${\Xi }_0$: 0.6, 1 (corresponding to GR), and 1.8. Multiple analyses were performed each catalog, comprising a population of approximately 5000 events, thanks to CHIMERA 2.0, which is 10-1000 times faster depending on the settings and catalog size. We jointly infer cosmological, modified GW propagation, and population hyperparameters. With spectroscopic galaxy catalogs, the fiducial ${\Xi }_0$ is recovered with a precision of $22\%$, $7.5\%$, and $10\%$ for ${\Xi }_0$ = 0.6, 1, and 1.8, respectively; while the precision on $H_0$ is 2-7 times worse than when ${\Xi }_0$ is not inferred. Finally,in the case of photometric redshifts the constraints degrade on average by 3.5 times in all cases, underscoring the importance of future spectroscopic surveys in maximizing the constraining power of standard sirens.

13 pages, 10 figures, 2 tables. CHIMERA 2.0 is be publicly available at https://github.com/CosmoStatGW/CHIMERA/. v2 matches the version published by A&A

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