Cosmological Evolution of a Tachyon-Quintom Model of Dark Energy

Abstract

In this work we study the cosmological evolution of a dark energy model with two scalar fields, i.e. the tachyon and the phantom tachyon. This model enables the equation of state $w$ to change from $w>-1$ to $w<-1$ in the evolution of the universe. The phase-space analysis for such a system with inverse square potentials shows that there exists a unique stable critical point, which has power-law solutions. In this paper, we also study another form of tachyon-quintom model with two fields, which voluntarily involves the interactions between both fields.

17 pages, 10 figures

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• Dynamics of Tachyon and Phantom Field beyond the Inverse Square Potentials
• Can the Big Bang Singularity be avoided by a single scalar field?
• Dynamical description of a quintom cosmological model nonminimally coupled with gravity
• Multi-fluid cosmology in Einstein gravity: analytical solutions
• Brane tachyon dynamics
• Reconstructing quintom from WMAP 5-year observations: Generalized ghost condensate
• Analysis cosmological tachyon and fermion model and observation data constraints
• The torsion cosmology in Kaluza-Klein theory
• Extended tachyon field using form invariance symmetry