The transient and the late time attractor tachyon dark energy: Can we distinguish it from quintessence ?

Details The transient and the late time attractor tachyon dark energy: Can we distinguish it from quintessence ? The transient and the late time attractor tachyon dark energy: Can we distinguish it from quintessence ?

2009-04-07

arxiv.org/abs/0904.1070v2

Phys.Rev.D79:123501,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 7 eps figures, Revtex style, minor changes, references added, Accepted in Physical Review D

Scientific paper

10.1103/PhysRevD.79.123501

The string inspired tachyon field can serve as a candidate of dark energy. Its equation of state parameter $w$ varies from 0 to -1. In case of tachyon field potential $V(\phi)\to 0$ slower(faster) than $1/\phi^2$ at infinity, dark energy(dark matter) is a late time attractor. We investigate the tachyon dark energy models under the assumption that $w$ is close to -1. We find that all the models exhibit unique behavior around the present epoch which is exactly same as that of the thawing quintessence.

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