Measuring $H_0$ from low-$z$ datasets

TL;DR

This paper estimates the Hubble constant using low-redshift observational data within different cosmological models, finding values that suggest potential new physics beyond the standard model if the data are reliable.

Contribution

It provides updated low-redshift Hubble constant measurements across multiple cosmological models using diverse datasets, highlighting the need for new physics.

Findings

H_0 in ΛCDM: 67.95 km/s/Mpc

H_0 in wCDM: 69.81 km/s/Mpc

H_0 in w0waCDM: 66.75 km/s/Mpc

Abstract

Adopting the low-redshift observational datasets, including the Pantheon sample of Type Ia supernovae, baryon acoustic oscillation measurements, and the tomographic Alcock-Paczynski method, we determine the Hubble constant to be $67.95^{+0.78}_{-1.03}$ , $69.81^{+2.22}_{-2.70}$ and $66.75^{+3.42}_{-4.23}$ km s$^{-1}$ Mpc$^{-1}$ at 68\% confidence level in the $\Lambda$CDM, $w$CDM and $w_0w_a$CDM models, respectively. Compared to the Hubble constant given by Riess et al. in 2019, we conclude that the new physics beyond the standard $\Lambda$CDM model is needed if all of these datasets are reliable.