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    What is needed of a tachyon if it is to be the dark energy? 

    Type: Journal Paper
    Author : Edmund J. Copeland; محمدرضا گروسی; M. Sami; Shinji Tsujikawa; Mohammad Reza Garousi
    Year: 2005
    Abstract:

    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 ...

    Constraints on Dirac-Born-Infeld type dark energy models from varying alpha 

    Type: Journal Paper
    Author : محمدرضا گروسی; M. Sami; Shinji Tsujikawa; Mohammad Reza Garousi
    Year: 2005
    Abstract:

    We study the variation of the effective fine structure constant alpha for Dirac-Born-Infeld (DBI) type dark energy models. The DBI action based on string theory naturally gives rise to a coupling between gauge fields and ...

    Non-abelian expansion of S-matrix elements and non-abelian tachyon DBI action 

    Type: Journal Paper
    Author : کاظم بی تقصیرفدافن; محمدرضا گروسی; ; Mohammad Reza Garousi; کاظم بی تقصیرفدافن; محمدرضا گروسی; Mohammad Reza Garousi
    Year: 2007
    Abstract:

    We apply the prescription proposed in hep-th/0307197 for non-abelian expansion of S-matrix elements, to the S-matrix element of four tachyons and one gauge field in superstring theory. We show that the leading order terms ...

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