Scalar Perturbation and Stability of Ricci Dark Energy

TL;DR

This paper analyzes the scalar perturbations of Ricci dark energy, establishing stability conditions based on the parameter alpha, which influences the universe's accelerated expansion.

Contribution

It provides a theoretical stability analysis of Ricci dark energy perturbations, deriving bounds on the parameter alpha.

Findings

Perturbations are stable if alpha > 1/3

Alpha < 1 is necessary for RDE to explain acceleration

Lower bound for alpha established as 1/3

Abstract

The Ricci dark energy (RDE) proposed to explain the accelerating expansion of the universe requires its parameter $\alpha < 1$, whose value will determine the behavior of RDE. In this Letter, we study the scalar perturbation of RDE with and without matter in the universe, and we find that in both cases, the perturbation is stable if $\alpha> 1/3$, which gives a lower bound for $\alpha$ theoretically.