Cosmological Evolution of a Quintom Model of Dark Energy

Abstract

We investigate in this paper the cosmological evolution of a dark energy model with two scalar fields where one of the scalar has canonical kinetic energy and another scalar has negative kinetic energy term. For such a system with exponential potentials we find that during the evolution of the universe the equation of state $w$ changes from $w>-1$ to $w<-1$, which is consistent with the recent observations. A phase-plane analysis shows that the "phantom"-dominated scaling solution is the stable late-time attractor of this type of models.

9 pages, 3 figures, LaTeX2e

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• Cosmological Scaling Solutions and Cross-coupling Exponential Potential
• Cosmological Scaling Solutions of Multiple Tachyon Fields with Inverse Square Potentials

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