Measuring $H_0$ from low-$z$ datasets

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 $67.95_{-1.03}^{+0.78}$ , $69.81_{-2.70}^{+2.22}$ and $66.75_{-4.23}^{+3.42}$ km s${}^{-1}$ Mpc${}^{-1}$ at 68\% confidence level in the $\Lambda$CDM, $w$CDM and $w_0{w}_a$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.

4 pages, 1 figure