Holographic Ricci dark energy as running vacuum

TL;DR

This paper explores a modified Ricci dark energy model with a running vacuum component, demonstrating it can avoid future singularities and predict a late-time accelerated expansion leading to a de Sitter universe.

Contribution

It introduces a new approach by adding a constant to Ricci dark energy, analytically solving the equations, and showing how this prevents future singularities and explains late-time acceleration.

Findings

The model removes future singularities.

It predicts a transition to late-time acceleration.

The universe tends to a de Sitter phase in the far future.

Abstract

Holographic Ricci dark energy has been proposed ago has faced with problems of future singularity. In the present work we consider the Ricci dark energy with an additive constant in it's density as running vacuum energy. We have analytically solved the Friedmann equations and also the role played by the general conservation law followed by the cosmic components together. We have shown that the running vacuum energy status of the Ricci dark energy helps to remove the possible future singularity in the model. The additive constant in the density of the running vacuum played an important role, such that, without that, the model predicts either eternal deceleration or eternal acceleration. But along with the additive constant, equivalent to a cosmological constant, the model predicts a late time acceleration in the expansion of the universe, and in the far future of the evolution it tends to de Sitter universe.