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

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

2005-12-31

arxiv.org/abs/hep-th/0601008v2

Phys.Rev.D73:084007,2006

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX file 20 pages, new subsections are added

Scientific paper

10.1103/PhysRevD.73.084007

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 such theory is endowed with a quite rich cosmological structure: it may naturally lead to an effective cosmological constant, quintessence or phantom cosmic acceleration, with a possible transition from deceleration to acceleration. It is demonstrated in the paper that this theory is perfectly viable, since it is compliant with Solar System constraints. Specific properties of $f(G)$ gravity in a de Sitter 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 addressed too.

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