The challenge of understanding the Universe's dynamics, particularly the Hubble tension, requires precise measurements of the Hubble constant. Building upon the existing spectral-siren method, which capitalizes on population information from gravitational-wave sources, this paper explores an alternative way to analyze the population data to obtain the cosmological parameters in ΛCDM. We demonstrated how non-parametric methods, which are flexible models that can be used to agnostically reconstruct arbitrary probability densities, can be incorporated into this framework and leverage the detector-frame mass distribution to infer the cosmological parameters. We tested our method with mock data and applied it to 70 binary black hole mergers from the third gravitational-wave transient catalog of the LIGO-Virgo-KAGRA Collaboration.
@article{arxiv.2410.23541,
title = {Inferring cosmology from gravitational waves using non-parametric detector-frame mass distribution},
author = {Thomas C. K. Ng and Stefano Rinaldi and Otto A. Hannuksela},
journal= {arXiv preprint arXiv:2410.23541},
year = {2025}
}