Finding Possibility of Dynamical Dark Energy with Hubble Parameters

TL;DR

This paper investigates whether current measurements of the Hubble parameter across different redshifts support the idea of dynamical dark energy, finding tentative evidence against a constant dark energy model.

Contribution

It introduces null hypothesis tests using Hubble parameter data to probe the evolution of dark energy, providing a new diagnostic approach in cosmology.

Findings

Rejection of constant dark energy at 1σ level from null tests.

Hubble parameter data suggests possible dynamical dark energy.

Method offers a new way to analyze dark energy evolution.

Abstract

The Hubble parameter is a critical measurement in cosmology, which contains the most direct information of the cosmic expansion history. Since discrepancy is found between low redshift and high redshift estimations of Hubble constant, we are interested in whether that tension indicates dynamical dark energy. In this paper we emphasize that the observed Hubble parameters at various redshifts, along with observed Hubble constant, can help us in probing the evolutional behavior of the mysterious dark energy. Null hypothesis tests are carried out with two diagnostic approaches. We find out that, according to the present measurements of Hubble parameters, rejection of constant dark energy is captured at $1\sigma$ level from null tests with and without the observed value of Hubble constant.