The $H_0$ Tension in Non-flat QCDM Cosmology

TL;DR

This paper investigates the discrepancy in Hubble constant measurements within a non-flat QCDM cosmological model, finding that the tension persists above 3.2 sigma even with generalized parameters and latest data.

Contribution

It extends QCDM cosmology models to non-flat universes and assesses the H0 tension, demonstrating the tension remains significant in this broader context.

Findings

H0 tension remains above 3.2 sigma in non-flat QCDM models

Generalized QCDM parametrizations do not resolve the H0 tension

Latest cosmological data support persistent H0 discrepancy

Abstract

The recent local measurement of Hubble constant leads to a more than $3\sigma$ tension with Planck + $\Lambda$CDM (Riess {\it et al} 2018). In this article we study the $H_0$ tension in non-flat QCDM cosmology, where Q stands for a minimally coupled and slowly-or-moderately rolling quintessence field $\phi$ with a smooth potential $V(\phi)$. By generalizing the QCDM one-parameter and three-parameter parametrizations in Huang {\it et al} 2011 to non-flat universe and using the latest cosmological data, we find that the $H_0$ tension remains above $3.2\sigma$ level for this class of model.