Cosmological Dynamics of Phantom Field

Details Cosmological Dynamics of Phantom Field Cosmological Dynamics of Phantom Field

2003-05-13

arxiv.org/abs/hep-th/0305110v2

Phys.Rev. D68 (2003) 023522

Physics

High Energy Physics

High Energy Physics - Theory

Typos corrected. Some clarifications and references added. To appear in Physical Review D

Scientific paper

10.1103/PhysRevD.68.023522

We study the general features of the dynamics of the phantom field in the cosmological context. In the case of inverse coshyperbolic potential, we demonstrate that the phantom field can successfully drive the observed current accelerated expansion of the universe with the equation of state parameter $w_{\phi} < -1$. The de-Sitter universe turns out to be the late time attractor of the model. The main features of the dynamics are independent of the initial conditions and the parameters of the model. The model fits the supernova data very well, allowing for $-2.4 < w_{\phi} < -1$ at 95 % confidence level.

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