Global behavior of cosmological dynamics with interacting Veneziano ghost

TL;DR

This paper analyzes the global dynamical behavior of the universe influenced by Veneziano ghost dark energy, using linearization and nullcline methods, and predicts potential future evolution and bifurcation phenomena.

Contribution

It introduces a novel approach to study cosmological dynamics with Veneziano ghost dark energy using generalized energy density and bifurcation analysis.

Findings

Universe may be dark energy dominated in certain parameter regions

Bifurcation phenomena indicate possible different evolutionary paths

Predicted universe fate depends on model parameters

Abstract

In this paper, we shall study the dynamical behavior of the universe accelerated by the so called Veneziano ghost dark energy component locally and globally by using the linearization and nullcline method developed in this paper. The energy density is generalized to be proportional to the Hawking temperature defined on the trapping horizon instead of Hubble horizon of the Friedmann-Robertson-Walker (FRW) universe. We also give a prediction of the fate of the universe and present the bifurcation phenomenon of the dynamical system of the universe. It seems that the universe could be dominated by dark energy at present in some region of the parameter space.