A multifield tachyon quintom model of dark energy and fate of the universe

TL;DR

This paper proposes a multi-field dark energy model combining tachyon and phantom tachyon scalars, analyzing its phase space stability to predict universe evolution and the crossing of the phantom divide.

Contribution

It introduces a novel multi-field tachyon-phantom model with phase space analysis, revealing stable solutions and the crossing of the phantom divide during cosmic evolution.

Findings

Stable power-law solutions identified.

The model predicts crossing of the phantom divide.

The universe's fate depends on the stability of critical points.

Abstract

We investigate a multi-field model of dark energy in this paper. We develop a model of dark energy with two multiple scalar fields, one we consider, is a multifield tachyon and the other is multi-field phantom tachyon scalars. We make an analysis of the system in phase space by considering inverse square potentials suitable for these models. Through the development of an autonomous dynamical system, the critical points and their stability analysis is performed. It has been observed that these stable critical points are satisfied by power law solutions. Moving on towards the analysis we can predict the fate of the universe. A special feature of this model is that it affects the equation of state parameter w to alter from being it greater than negative one to be less than it during the evolutionary phase of the universe. Thus, its all about the phantom divide which turns out to be decisive in the evolution of the cosmos in these models.