Gravitational Wave Cosmology Improves Hubble Constant Measurement

This study demonstrates the power of spectral-sirens inference to extract cosmological parameters from gravitational wave data alone. By introducing new parametric mass functions for binary black hole populations, the researchers achieved a significant improvement in the precision of the Hubble constant measurement. The analysis of the GWTC-4.0 catalog yielded a 23% precision in determining the Hubble constant, approaching the accuracy of traditional methods. This result highlights the strong interplay between the black hole mass distribution and inferred cosmology, underscoring the need for suitable population models to fully exploit gravitational-wave data. The projection to future O5 observing runs suggests substantial improvements in cosmological parameter estimation with larger datasets at higher redshifts. This research contributes to the ongoing effort to resolve the Hubble tension and refine our understanding of the universe's expansion history. The ability to independently constrain cosmological parameters using gravitational waves is a significant step forward in cosmology.

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