Holographic dark energy at the Ricci scale

TL;DR

This paper explores a holographic dark energy model based on Ricci scale, where dark matter and dark energy interact non-gravitationally, addressing the cosmic coincidence problem and fitting multiple observational data sets.

Contribution

It introduces a Ricci-scale holographic dark energy model with interacting dark components, providing a new approach to cosmic coincidence and observational consistency.

Findings

Model aligns with supernovae and CMB data

Interaction reduces the cosmic coincidence problem

Consistent with galaxy cluster and growth function observations

Abstract

We consider a holographic cosmological model in which the infrared cutoff is fixed by the Ricci's length and dark matter and dark energy do not evolve separately but interact non-gravitationally with one another. This substantially alleviates the cosmic coincidence problem as the ratio between both components remains finite throughout the expansion. We constrain the model with observational data from supernovae, cosmic background radiation, baryon acoustic oscillations, gas mass fraction in galaxy clusters, the history of the Hubble function, and the growth function. The model shows consistency with observation.