Cosmological constraints from higher redshift gamma-ray burst, HII starburst galaxy, and quasar (and other) data

We use higher redshift gamma-ray burst (GRB), HII starburst galaxy (H IIG), and quasar angular size (QSO-AS) measurements to constrain six spatially flat and non-flat cosmological models. These three sets of cosmological constraints are mutually consistent. Cosmological constraints from a joint analysis of these data sets are largely consistent with currently accelerating cosmological expansion and with cosmological constraints derived from a combined analysis of Hubble parameter (H(z)) and baryon acoustic oscillation (BAO, with Planck-determined baryonic matter density) measurements. A joint analysis of the H(z) + BAO + QSO-AS + HIIG + GRB data provides fairly model-independent determinations of the non-relativistic matter density parameter Omega(m0) = 0.313 +/- 0.013 and the Hubble constant H-0 = 69.3 +/- 1.2 kms(-1) Mpc(-1). These data are consistent with the dark energy being a cosmological constant and with spatial hypersurfaces being flat, but they do not rule out mild dark energy dynamics or a little spatial curvature. We also investigate the effect of including quasar flux measurements in the mix and find no novel conclusions.

Automated summary

The study utilizes various cosmological constraints from different observational data sets, confirming mutual consistency. The results suggest that the universe is undergoing accelerating expansion, with dark energy potentially acting as a cosmological constant and spatial hypersurfaces likely being flat.