الموجات الثقالية تحسّن قياس معدل توسع الكون سريع

الملخص الأصلي

كما كتبه المؤلفون، بالإنجليزية arXiv:2601.04774v1

We present a new measurement of the Hubble constant ($$H_0$$) resulting from the first joint analysis of standard sirens with weak gravitational lensing and galaxy clustering observables comprising three two-point correlation functions (3$$\times$$2pt). For the 3$$\times$$2pt component of the analysis, we use data from the Dark Energy Survey (DES) Year 3 release. For the standard sirens component, we use data from the Gravitational-Wave Transient Catalog 4.0 released by the LIGO-Virgo-KAGRA (LVK) Collaboration. For GW170817, the only standard siren for which extensive electromagnetic follow-up observations exist, we also use measurements of the host galaxy redshift and inclination angle estimates derived from observations of a superluminal jet from its remnant. Our joint analysis yields $$H_0 = 67.9^{+4.4}_{-4.3}$$~km~s$$^{-1}$$~Mpc$$^{-1}$$, a $$6.4\%$$ measurement, while improving the DES constraint on the total abundance of matter $$\Omega_m$$ by $$22\%$$. Removing the jet information degrades the $$H_0$$ precision to $$9.9\%$$. The measurement of $$H_0$$ remains a central problem in cosmology with a multitude of approaches being vigorously pursued in the community aiming to reconcile significantly discrepant measurements at the percent-level. In light of the impending new data releases from DES and LVK, and anticipating much more constraining power from 3$$\times$$2pt observables using newly commissioned survey instruments, we demonstrate that incorporating standard sirens into the cosmology framework of large cosmic surveys is a viable route towards that goal.