Observational constraints on the interacting Ricci dark energy model

TL;DR

This paper investigates an extended holographic Ricci dark energy model with interaction between dark energy and matter, using observational data to constrain model parameters and find that a non-zero interaction is favored.

Contribution

It introduces an interacting Ricci dark energy model and constrains its parameters using current observational data, showing the interaction is supported by observations.

Findings

Non-zero interaction rate is favored by data.

Best fit parameters are alpha=0.45 and gamma=0.15.

Model aligns with current dark energy density observations.

Abstract

We consider an extension of the holographic Ricci dark energy model by introducing an interaction between dark energy and matter. In this model, the dark energy density is given by $rho_{Lambda}=-frac{1}{2}alpha M_{p}^{2}{R}$, where ${R}$ is the Ricci scalar curvature, $M_{p}$ is the reduced Planck mass, and $alpha$ is a dimensionless parameter. The interaction rate is given by $Q=gamma H rho_{Lambda}$, where $H$ is the Hubble expansion rate, and $gamma$ is a dimensionless parameter. We investigate current observational constraints on this model by applying the type Ia supernovae, the baryon acoustic oscillation and the CMB anisotropy data. It is shown that a nonvanishing interaction rate is favored by the observations. The best fit values are $alpha=0.45 pm 0.03$ and $gamma=0.15 pm 0.03$ for the present dark energy density parameter $Omega_{Lambda 0}=0.73 pm0.03$.