Phantom Cosmology with Non-minimally Coupled Real Scalar Field

TL;DR

This paper explores the use of a non-minimally coupled real scalar field as a phantom dark energy model to explain the universe's accelerated expansion and the possibility of an equation of state parameter less than -1.

Contribution

It introduces a novel approach of using a non-minimally coupled scalar field as a phantom to achieve w<-1, with derived evolution equations expressed in observable terms.

Findings

Universe's acceleration confirmed by SN-Ia data

Scalar field model can produce w<-1

Derived equations relate model to observations

Abstract

We find that the expansion of the universe is accelerating by analyzing the recent observation data of type $\textsc{I}a$ supernova(SN-Ia) .It indicates that the equation of state of the dark energy might be smaller than -1,which leads to the introduction of phantom models featured by its negative kinetic energy to account for the regime of equation of state parameter $w<-1$.In this paper the possibility of using a non-minimally coupled real scalar field as phantom to realize the equation of state parameter $w<-1$ is discussed.The main equations which govern the evolution of the universe are obtained.Then we rewrite them with the observable quantities.