Studies on dark energy evolution

TL;DR

This study investigates the evolution of dark energy density using recent supernova and Hubble data, finding minimal deviations from the standard cosmological model and suggesting limited evidence for dark energy evolution.

Contribution

It introduces parametrizations of dark energy density and reconstructs the equation of state parameter w(z) using latest observations, including an interacting dark energy model.

Findings

Small deviation from LCDM at 1σ in X(z)

Evolution evidence diminishes at 2σ confidence

Interacting dark energy model shows similar trend

Abstract

In this work we explore signatures of evolution for the dark energy density $X(z)=\rho_{de}(z)/\rho_{de}(0)$ using latest observations on SNIa and H(z). The models consist of parametrizations of the dark energy density and consequently a reconstruction for the EoS parameter w(z) as a function of redshift. Both parametrization methods using the SH0Es prior results in a small deviation from LCDM at 1$\sigma$ for $X(z)$. Extending the analysis up to 2$\sigma$, the evidence for evolution of $X(z)$ dilute in both cases. We have also studied an interacting dark model where this trend is also found.