Physical Review D, ( ISI ), Year (2005-3)

Title : Cosmology from a rolling massive scalar field on the onti-D3 brane of de sitter vacua ( What is needed of a tachyon if it is to be the dark energy? )

Authors: Edmund J. Copeland , Mohammad Reza Garousi , M. Sami , Shinji Tsujikawa ,

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We study a dark energy scenario in the presence of a tachyon field $\\\\phi$ with potential $V(\\\\phi)$ and a barotropic perfect fluid. The cosmological dynamics crucially depends on the asymptotic behavior of the quantity $\\\\lambda=-M_pV_\\\\phi/V^{3/2}$. If $\\\\lambda$ is a constant, which corresponds to an inverse square potential $V(\\\\phi) \\\\propto \\\\phi^{-2}$, there exists one stable critical point that gives an acceleration of the universe at late times. When $\\\\lambda \\\\to 0$ asymptotically, we can have a viable dark energy scenario in which the system approaches an ``instantaneous\\\'\\\' critical point that dynamically changes with $\\\\lambda$. If $|\\\\lambda|$ approaches infinity asymptotically, the universe does not exhibit an acceleration at late times. In this case, however, we find an interesting possibility that a transient acceleration occurs in a regime where $|\\\\lambda|$ is smaller than of order unity

Keywords

, Dark energy, Tachyon
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@article{paperid:201565,
author = {Edmund J. Copeland and Garousi, Mohammad Reza and M. Sami and Shinji Tsujikawa},
title = {Cosmology from a rolling massive scalar field on the onti-D3 brane of de sitter vacua},
journal = {Physical Review D},
year = {2005},
month = {March},
issn = {1550-7998},
keywords = {Dark energy; Tachyon action},
}

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%0 Journal Article
%T Cosmology from a rolling massive scalar field on the onti-D3 brane of de sitter vacua
%A Edmund J. Copeland
%A Garousi, Mohammad Reza
%A M. Sami
%A Shinji Tsujikawa
%J Physical Review D
%@ 1550-7998
%D 2005

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