A Quintom scenario with mixed kinetic terms

TL;DR

This paper explores an extended quintom dark energy model with kinetic coupling, revealing new late-time behaviors including solutions that cross the phantom divide, through phase space analysis.

Contribution

It introduces a kinetic interaction between scalar fields in the quintom model, leading to novel cosmological solutions and behaviors.

Findings

Existence of both quintessence-like and phantom-like late-time solutions

Discovery of solutions crossing the phantom divide during evolution

Kinetic coupling induces new cosmological dynamics

Abstract

We examine an extension of the quintom scenario of dark energy, in which a canonical scalar field and a phantom field are coupled through a kinetic interaction. We perform a phase space analysis and show that the kinetic coupling gives rise to novel cosmological behaviour. In particular, we obtain both quintessence-like and phantom-like late-time solutions, as well as solutions that cross the phantom divide during the evolution of the universe.