Exploring hints for dark energy density evolution in light of recent data

TL;DR

This paper investigates the evolution of dark energy density using various cosmological data sets, finding evidence for its decrease with redshift when excluding CMB data, which supports recent observational studies.

Contribution

It introduces a quadratic parametrization of dark energy density and analyzes its evolution with multiple observational data sets, highlighting potential trends.

Findings

Dark energy density decreases with redshift when CMB data is excluded.

Results align with recent BAO DR11 findings.

Supports evolving dark energy models.

Abstract

Considering a quadratic parametrization of the dark energy density, we explore signatures of evolution using data from gas mass fraction in clusters, type Ia supernova, BAO and CMB. We find -- excluding CMB data -- a preference for a evolution of $\rho_{de}(z)$ towards smaller values as redshift increases, a result consistent with a recent study using the BAO DR11 data by Delubac et al. (2015).