Probing Ricci dark energy model with perturbations by using WMAP seven-year cosmic microwave background measurements, BAO and Type Ia supernovae

TL;DR

This study tests the Ricci dark energy model against current cosmological data, including CMB, BAO, and supernovae, to evaluate its viability and differences from the cosmological constant model.

Contribution

It provides the first comprehensive joint constraint on the Ricci dark energy model using full CMB, BAO, and supernova data with perturbations.

Findings

Ricci dark energy model fits current data well.

Differences observed in CMB power spectra compared to ΛCDM.

Best-fit parameters favor Ricci dark energy over cosmological constant.

Abstract

In this paper, we investigate the Ricci dark energy model with perturbations through the joint constraints of current cosmological data sets from dynamical and geometrical perspectives. We use the full cosmic microwave background information from WMAP seven-year data, the baryon acoustic oscillations from the Sloan Digital Sky Survey and the Two Degree Galaxy Redshift Survey, and type Ia supernovae from the Union2 compilation of the Supernova Cosmology Project Collaboration. A global constraint is performed by employing the Markov chain Monte Carlo method. With the best-fitting results, we show the differences of cosmic microwave background power spectra and background evolutions for the cosmological constant model and Ricci dark energy model with perturbations.