Determining the Hubble constant from Hubble parameter measurements

TL;DR

This study uses 28 Hubble parameter measurements across various redshifts to estimate the current Hubble constant in multiple cosmological models, finding results consistent with lower CMB and BAO-based values.

Contribution

It provides new estimates of H_0 using H(z) data across different models, highlighting consistency with lower H_0 measurements and addressing the Hubble tension.

Findings

H_0 estimates range from 65.0 to 68.4 km/s/Mpc across models.

Results align with CMB and BAO measurements, not higher local values.

H_0 values are within 2σ of local measurements.

Abstract

We use 28 Hubble parameter, $H(z)$, measurements at intermediate redshifts $0.07 \leq z \leq 2.3$ to determine the present-day Hubble constant $H_0$ in four cosmological models. We measure $H_0 = 68.3^{ +2.7}_{ -2.6 }, 68.4^{ +2.9 }_{ -3.3 }, 65.0^{ +6.5 }_{ -6.6 }$ and $ 67.9^{ +2.4}_{-2.4}$ km s${}^{-1}$ Mpc${}^{-1}$ (1$\sigma$ errors) in the $\Lambda$CDM (spatially flat and non-flat), $\omega$CDM and $\phi$CDM models, respectively. These measured $H_0$ values are more consistent with the lower values determined from recent cosmic microwave background and baryon acoustic oscillation data, as well as with that found from a median statistics analysis of Huchra's compilation of $H_0$ measurements,but include the higher local measurements of $H_0$ within the 2$\sigma$ confidence limits.