Dark energy in modified Gauss-Bonnet gravity: Late-time acceleration and the hierarchy problem

Guido Cognola, Emilio Elizalde, Shin'Ichi Nojiri, Sergei D. Odintsov, Sergio Zerbini

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    515 Citations (Scopus)

    Abstract

    Dark energy cosmology is considered in a modified Gauss-Bonnet (GB) model of gravity where an arbitrary function of the GB invariant, f(G), is added to the general relativity action. We show that a theory of this kind is endowed with a quite rich cosmological structure: it may naturally lead to an effective cosmological constant, quintessence, or phantom cosmic acceleration, with a possibility for the transition from deceleration to acceleration. It is demonstrated in the paper that this theory is perfectly viable, since it is compliant with the solar system constraints. Specific properties of f(G) gravity in a de Sitter (dS) universe, such as dS and SdS solutions, their entropy, and its explicit one-loop quantization are studied. The issue of a possible solution of the hierarchy problem in modified gravities is also addressed. © 2006 The American Physical Society.
    Original languageEnglish
    Article number084007
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume73
    Issue number8
    DOIs
    Publication statusPublished - 12 Apr 2006

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