Cosmography with gravitational waves I: Taylor expansion in the low-redshift regime

Jonathan Morais; Rodrigo Gonçalves; Jailson Alcaniz

doi:10.1016/j.dark.2026.102464

paper

Cosmography with gravitational waves I: Taylor expansion in the low-redshift regime

arXiv:2602.05969 · doi:10.1016/j.dark.2026.102464

Abstract

We evaluate the capability of current and next-generation gravitational-wave detectors, including Advanced LIGO, the Einstein Telescope, and DECIGO, to probe cosmographic parameters using electromagnetically bright standard sirens. Adopting a third-order Taylor expansion, we examine the constraints primarily as a function of the number of detections and, in a complementary analysis, across correlated SNR--redshift regimes. Advanced LIGO can provide a distance-ladder-independent measurement of $H_{0}$ at the percent level. As the catalogue size increases, the Einstein Telescope reaches subpercent precision on $H_{0}$ and measures $q_{0}$ at the tens-of-percent level. DECIGO extends this sensitivity to $j_{0}$ , achieving precision at the few-tens-of-percent level.

arXiv comment16 pages, 6 figures, 9 tables. Published in Physics of the Dark Universe. Title and manuscript updated to match the published version