No Evidence for Dark Energy Evolution from a global analysis of cosmological data

TL;DR

This study employs principal component analysis on diverse cosmological data sets to test for dark energy evolution, finding no significant evidence for deviation from a cosmological constant.

Contribution

It introduces a novel application of principal component analysis to constrain dark energy evolution across multiple redshift bins using comprehensive data.

Findings

No significant evidence for dark energy evolution.

Data consistent with a cosmological constant.

Future surveys could improve constraints.

Abstract

We use a variant of principal component analysis to investigate the possible temporal evolution of the dark energy equation of state, $w(z)$. We constrain $w(z)$ in multiple redshift bins, utilizing the most recent data from Type Ia supernovae, the cosmic microwave background, baryon acoustic oscillations, the integrated Sachs-Wolfe effect, galaxy clustering, and weak lensing data. Unlike other recent analyses, we find no significant evidence for evolving dark energy; the data remains completely consistent with a cosmological constant. We also study the extent to which the time-evolution of the equation of state would be constrained by a combination of current and future-generation surveys, such as Planck and the Joint Dark Energy Mission.