Observational constraints on non-flat dynamical dark energy cosmological models

TL;DR

This study uses observational data to constrain non-flat, dynamic dark energy models, finding they are consistent with flat models but also allow for mild curvature and slow evolution, with curvature density parameter |Ω_{k0}| less than 0.15.

Contribution

It provides observational constraints on non-flat, time-evolving dark energy models, expanding understanding beyond the standard flat ΛCDM model.

Findings

Curvature parameter |Ω_{k0}| less than 0.15 at 1σ confidence.

Data compatible with both flat and mildly non-flat dark energy models.

Inclusion of curvature broadens the allowed parameter space.

Abstract

We constrain two non-flat time-evolving dark energy cosmological models by using Hubble parameter data, Type Ia supernova apparent magnitude measurements, and baryonic acoustic oscillation peak length scale observations. The inclusion of space curvature as a free parameter in the analysis results in a significant broadening of the allowed range of values of the parameter that governs the time evolution of the dark energy density in these models. While consistent with the "standard" spatially-flat $\Lambda$CDM cosmological model, these data are also consistent with a range of mildly non-flat, slowly time-varying dark energy models. After marginalizing over all other parameters, these data require the averaged magnitude of the curvature density parameter $|\Omega_{k0}| \lesssim 0.15$ at 1$\sigma$ confidence.