Cosmography of interacting generalized QCD ghost dark energy

TL;DR

This paper analyzes the generalized ghost dark energy model's evolution and observational compatibility, considering both non-interacting and interacting scenarios, and examines its behavior through statefinder diagnostics and perturbation theory.

Contribution

It introduces the analysis of GGDE with interaction effects and demonstrates how interaction influences the model's evolutionary trajectories and observational alignment.

Findings

Interaction enables crossing the phantom line.

Trajectories in the s-r plane are distinguishable in the interacting case.

Model's current state aligns with observations for negative parameters.

Abstract

Exploring the accelerated expansion of the universe, we investigate the generalized ghost dark energy (GGDE) model from the statefinder diagnosis analysis in a flat FRW universe. First we calculate the cosmological evolution and statefinder trajectories for non-interacting case and then extend this work by considering the interaction between dark matter and dark energy components. We show that in the non-interacting case the phantom line can not be crossed and also he evolutionary trajectories of model in $s-r$ plane can not be discriminated. It has been shown that the present location of model in $s-r$ plane would be close to observational value for negative values of model parameter. In the presence of interaction between dark matter and dark energy, the phantom regime is achieved, the accelerated phase of expansion occurs sooner compare with non-interacting case. The GGDE model is also discussed from the viewpoint of perturbation theory by calculating the adiabatic sound speed of the model. Finally, unlike the non-interacting case, the evolutionary trajectories in $s-r$ plane can be discriminated in the interacting model. Like non-interacting model, in the interacting case the present location of GGDE model is closer to observational value for negative values of model parameter.