Dynamical analysis and statefinder of Barrow holographic dark energy

TL;DR

This paper investigates the stability and evolution of Barrow holographic dark energy using dynamical and statefinder analyses, demonstrating a stable model with accelerated expansion that can be distinguished from the standard cosmological model.

Contribution

It applies dynamical and statefinder methods to Barrow holographic dark energy with different IR cutoffs and interactions, revealing stability, attractor behavior, and the ability to solve the coincidence problem.

Findings

Model is stable with Hubble horizon cutoff and interaction Q.

Existence of an attractor corresponding to accelerated expansion.

Model can be distinguished from ΛCDM using statefinder analysis.

Abstract

Based on the holographic principle and the Barrow entropy, Barrow holographic dark energy had been proposed. In order to analyze the stability and the evolution of Barrow holographic dark energy, we, in this paper, apply the dynamical analysis and statefinder methods to Barrow holographic dark energy with different IR cutoff and interacting terms. In the case of using Hubble horizon as IR cutoff with the interacting term $Q=\frac{\lambda}{H}\rho_{m}\rho_{D}$, we find this model is stable and can be used to describe the whole evolution of the universe when the energy transfers from the pressureless matter to the Barrow holographic dark energy. When the dynamical analysis method is applied to this stable model, an attractor corresponding to an accelerated expansion epoch exists and this attractor can behave as the cosmological constant. Furthermore, the coincidence problem can be solved in this case. Then, after using the statefinder analysis method to this model, we find this model can be discriminated from the standard $\Lambda$CDM model. Finally, we have discussed the turning point of Hubble diagram in Barrow holographic dark energy and find the turning point does not exist in this model.