Dynamical dark energy can explain the anomalous matter density fluctuation at $z\sim4$

TL;DR

This paper shows that dynamical dark energy models can resolve a growth tension at redshift around 4, suggesting dark energy may evolve over time, which could explain discrepancies in high-redshift large scale structure measurements.

Contribution

The study demonstrates that dynamical dark energy can resolve the growth tension at high redshift within the standard cosmological model.

Findings

Dynamical dark energy explains the growth tension at z~4.

Dark energy evolution may be evidenced by high-redshift structure measurements.

The tension is resolved within 1 sigma confidence level.

Abstract

Recently, under the standard cosmological model, a new growth tension between the Planck-2018 observation and the combined observation of cosmic microwave background lensing and galaxy clustering at $z\sim4$ emerges over the $1\,\sigma$ confidence level. We demonstrate that dynamical dark energy can well solve this tension within the $1\,\sigma$ confidence level. This implies that the new measurement of large scale structure at high redshift may give the evidence of evolution of dark energy over time.