High-resolution temporal constraints on the dynamics of dark energy

TL;DR

This paper analyzes recent cosmological data to investigate the evolution of dark energy's equation of state up to redshift one, finding no significant evidence for dynamical behavior and supporting the cosmological constant model.

Contribution

It provides the most flexible parametrization of dark energy to date, including perturbations, and constrains its evolution with comprehensive data analysis.

Findings

No significant evidence for dynamical dark energy

Cosmological constant model consistent with data from redshift zero to one

Constraints derived using principal component analysis

Abstract

We use the recent type Ia supernova, cosmic microwave background and large-scale structure data to shed light on the temporal evolution of the dark energy equation of state $w(z)$ out to redshift one. We constrain the most flexible parametrization of dark energy to date, and include the dark energy perturbations consistently throughout. Interpreting our results via the principal component analysis, we find no significant evidence for dynamical dark energy: the cosmological constant model is consistent with data everywhere between redshift zero and one at 95% C.L.