Cosmological Evolution of a Tachyon-Quintom Model of Dark Energy

Details Cosmological Evolution of a Tachyon-Quintom Model of Dark Energy Cosmological Evolution of a Tachyon-Quintom Model of Dark Energy

2008-12-22

arxiv.org/abs/0812.4022v2

JCAP 0904:027,2009

Astronomy and Astrophysics

Astrophysics

17 pages, 10 figures

Scientific paper

10.1088/1475-7516/2009/04/027

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.

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