Dark energy generated from a (super-) string effective action with higher-order curvature corrections and a dynamical dilaton

E. Elizalde, S. Jhingan, S. Nojiri, S. D. Odintsov, M. Sami, I. Thongkool

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    31 Citations (Scopus)

    Abstract

    We investigate the possibility of a dark energy universe emerging from an action with higher-order string loop corrections to Einstein gravity in the presence of a massless dilaton. These curvature corrections (up to R4 order) are different depending upon the type of (super-) string model which is considered. We find in fact that type II, heterotic, and bosonic strings respond differently to dark energy. A dark energy solution is shown to exist in the case of the bosonic string, while the other two theories do not lead to realistic dark energy universes. A detailed analysis of the dynamical stability of the de Sitter solution is presented for the case of a bosonic string. A general prescription for the construction of a de Sitter solution for the low-energy (super-) string effective action is also indicated. Beyond the low-energy (super-) string effective action, when the higher-curvature correction coefficients depend on the dilaton, the reconstruction of the theory from the expansion history of the universe is done with a corresponding prescription for the scalar potentials. © 2007 Springer-Verlag / Società Italiana di Fisica.
    Original languageEnglish
    Pages (from-to)447-457
    JournalEuropean Physical Journal C
    Volume53
    Issue number3
    DOIs
    Publication statusPublished - 1 Feb 2008

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