H0=69.8 ± 1.3 km s-1 Mpc-1, ωm0=0.288 ± 0.017, and other constraints from lower-redshift, non-CMB, expansion-rate data

We use updated type Ia Pantheon + supernova, baryon acoustic oscillation, and Hubble parameter (now also accounting for correlations) data, as well as new reverberation-measured C IV quasar data, and quasar angular size, H II starburst galaxy, reverberation-measured Mg II quasar, and Amati-correlated gamma-ray burst data to constrain cosmological parameters. We show that these datasets result in mutually consistent constraints and jointly use them to constrain cosmological parameters in six different spatially flat and nonflat cosmological models. Our analysis provides summary model-independent determinations of two key cosmological parameters: the Hubble constant, H0 = 69.8 +/- 1.3 km s-1 Mpc-1, and the current nonrelativistic matter density parameter, omega m0 = 0.288 +/- 0.017. Our summary error bars are 2.4 and 2.3 times those obtained using the flat cosmological constant cold dark matter (?CDM) model and Planck TT, TE, EE + lowE + lensing cosmic microwave background (CMB) anisotropy data. Our H0 value is very consistent with that from the local expansion rate based on the tip of the red giant branch and type Ia supernova (SN Ia) data, is 2 sigma lower than that from the local expansion rate based on Cepheid and SN Ia data, and is 2 sigma higher than that in the flat ?CDM model based on Planck TT, TE, EE + lowE + lensing CMB data. Our data compilation shows at most mild evidence for nonflat spatial hypersurfaces, but more significant evidence for dark energy dynamics, 2 sigma or larger in the spatially flat dynamical dark energy models we study.

Automated summary

We use various data sets, including supernova, baryon acoustic oscillation, quasar, and gamma-ray burst data, to constrain cosmological parameters and provide model-independent determinations of the Hubble constant and the current nonrelativistic matter density parameter. Our analysis shows consistent constraints and suggests evidence for dark energy dynamics. Our results are compared to other models and data, showing mild evidence for nonflat spatial hypersurfaces.