Modified holographic Ricci dark energy model and statefinder diagnosis in flat universe

TL;DR

This paper explores a modified holographic Ricci dark energy model in a flat universe, analyzing its evolution, statefinder diagnostics, and how it differs from standard models like Lambda-CDM, especially in its behavior over cosmic time.

Contribution

It introduces a modified holographic Ricci dark energy model and investigates its evolutionary behavior and diagnostic trajectories in statefinder planes, highlighting differences from standard cosmological models.

Findings

Dark energy behaves like cold dark matter at past times.

Model trajectories depend on parameters and differ from Lambda-CDM.

Present statefinder parameters vary with model parameters.

Abstract

Evolution of the universe with modified holographic Ricci dark energy model is considered. Dependency of the equation of state parameter and deceleration parameter on the redshift and model parameters are obtained. It is shown that the density evolution of both non-relativistic matter and dark energy are the same until recent times. The evolutionary trajectories of the model for different model parameters are obtained in the statefinder planes, r-s and r-q planes. The present statefinder parameters are obtained for different model parameter values, using that the model is differentiated from other standard models like $\Lambda$CDM model etc. We have also shown that the evolutionary trajectories are depending on the model parameters, and at past times the dark energy is behaving like cold dark matter, with equation of state equal to zero.