The tension on the cosmological parameters from different observational data

TL;DR

This paper investigates the discrepancy in cosmological parameters, especially the Hubble constant, from different observations, concluding that the tension is not due to the choice of dark energy models.

Contribution

The study shows that the tension in Hubble constant measurements persists regardless of the dynamical dark energy models used, suggesting other sources for the discrepancy.

Findings

No significant change in H_0 constraints across dark energy models

Tension with local H_0 measurements remains even with tightened error bars

The fitting model is unlikely the cause of the H_0 tension

Abstract

Planck measurements of the cosmic microwave background power spectra find a lower value of the Hubble constant $H_0$ and a higher value of the fractional matter energy density $\Omega_{m0}$ for the concordance $\Lambda$CDM model, and these results are in tension with other measurements. The {\em Planck} group argued that the tension came either from some sources of unknown systematic errors in some astrophysical measurements or the wrong $\Lambda$CDM model applied in fitting the data. We studied the reason for the tension on $H_0$ from different measurements by considering two dynamical dark energy models. We found that there is no tension between different data, the constraint on $H_0$ is almost unchanged for different dark energy models and the tension with the local measurements remains when the error bar on $H_0$ is tightened to be around 1. We argue that the tension on $H_0$ is not caused by the fitting model.