A Holographic Dark Energy Model from Ricci Scalar Curvature

TL;DR

This paper introduces a holographic dark energy model based on Ricci scalar curvature, addressing causality issues and solving the coincidence problem, while maintaining consistency with observational data.

Contribution

It proposes a novel dark energy model using Ricci scalar curvature instead of the event horizon, avoiding causality problems and aligning with observations.

Findings

Model avoids causality issues

Successfully addresses the coincidence problem

Minor impact on matter power spectra and CMB anisotropy

Abstract

Motivated by the holographic principle, it has been suggested that the dark energy density may be inversely proportional to the area of the event horizon of the Universe. However, such a model would have a causality problem. In this paper, we propose to replace the future event horizon area with the inverse of the Ricci scalar curvature. We show that this model does not only avoid the causality problem and is phenomenologically viable, but also naturally solves the coincidence problem of dark energy. Our analysis of the evolution of density perturbations show that the matter power spectra and CMB temperature anisotropy is only slightly affected by such modification.