Statefinder analysis of the superfluid Chaplygin gas model

TL;DR

This paper uses statefinder diagnostics to analyze the superfluid Chaplygin gas model, which unifies dark energy and dark matter as a superfluid with Bose-Einstein condensate and excitations, revealing its distinct evolutionary behavior.

Contribution

It applies the statefinder diagnostic to the superfluid Chaplygin gas model, highlighting its unique features and differences from other Chaplygin gas models in cosmology.

Findings

Statefinder diagrams distinguish the SCG model from other Chaplygin gas models.

The DM equation of state significantly affects the model's trajectories.

The current statefinder position indicates specific cosmological parameters.

Abstract

The statefinder indices are employed to test the superfluid Chaplygin gas (SCG) model describing the dark sector of the universe. The model involves Bose-Einstein condensate (BEC) as dark energy (DE) and an excited state above it as dark matter (DM). The condensate is assumed to have a negative pressure and is embodied as an exotic fluid with the Chaplygin equation of state. Excitations forms the normal component of superfluid. The statefinder diagrams show the discrimination between the SCG scenario and other models with the Chaplygin gas and indicates a pronounced effect of the DM equation of state and an indirect interaction between their two components on statefinder trajectories and a current statefinder location.