Using Pantheon and DES supernova, baryon acoustic oscillation, and Hubble parameter data to constrain the Hubble constant, dark energy dynamics, and spatial curvature

TL;DR

This study combines multiple cosmological data sets to provide model-independent estimates of the Hubble constant and matter density, exploring dark energy dynamics and spatial curvature with consistent results.

Contribution

It offers a comprehensive joint analysis of diverse observational data to constrain key cosmological parameters, including Hubble constant and spatial curvature, with improved restrictions.

Findings

Hubble constant estimated at 68.8±1.8 km/s/Mpc

Matter density parameter estimated at 0.294±0.020

Constraints favor mild dark energy dynamics and near-flat spatial geometry

Abstract

We use Pantheon Type Ia supernova (SN Ia) apparent magnitude, DES-3yr binned SN Ia apparent magnitude, Hubble parameter, and baryon acoustic oscillation measurements to constrain six spatially flat and non-flat cosmological models. These sets of data provide mutually consistent cosmological constraints in the six cosmological models we study. A joint analysis of these data sets provides model-independent estimates of the Hubble constant, $H_0=68.8\pm1.8\ \rm{km \ s^{-1} \ Mpc^{-1}}$, and the non-relativistic matter density parameter, $\Omega_{\rm m_0}=0.294\pm0.020$. Although the joint constraints prefer mild dark energy dynamics and a little spatial curvature, they do not rule out dark energy being a cosmological constant and flat spatial hypersurfaces. We also add quasar angular size and H II starburst galaxy measurements to the combined data set and find more restrictive constraints.