Cosmological Dynamics of Phantom Field

TL;DR

This paper analyzes the behavior of phantom fields in cosmology, showing they can explain the universe's accelerated expansion and fit supernova data well, with the de-Sitter universe as a late-time attractor.

Contribution

It demonstrates that phantom fields with inverse coshyperbolic potential can account for current acceleration and fit observational data, highlighting their dynamical stability.

Findings

Phantom fields can drive accelerated expansion with w < -1.

The de-Sitter universe is a late-time attractor.

Model fits supernova data with -2.4 < w < -1 at 95% confidence.

Abstract

We study the general features of the dynamics of the phantom field in the cosmological context. In the case of inverse coshyperbolic potential, we demonstrate that the phantom field can successfully drive the observed current accelerated expansion of the universe with the equation of state parameter $w_{\phi} < -1$. The de-Sitter universe turns out to be the late time attractor of the model. The main features of the dynamics are independent of the initial conditions and the parameters of the model. The model fits the supernova data very well, allowing for $-2.4 < w_{\phi} < -1$ at 95 % confidence level.