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LambdaCDM epoch reconstruction from F(R,G) and modified Gauss-Bonnet gravities

Dark energy cosmology is considered in a modified Gauss-Bonnet model of gravity with and without a scalar field. It is shown that these generalizations of General Relativity endow it with a very rich cosmological structure: it may naturally lead to an effective cosmological constant, quintessence or phantom cosmic acceleration, with the possibility to describe the transition from a decelerating to an accelerating phase explicitly. It is demonstrated here that these modified GB and scalar-GB theories are perfectly viable as cosmological models. They can describe the LambdaCDM cosmological era without any need for a cosmological constant. Specific properties of these theories of gravity in different particular cases, such as the de Sitter one, are studied.

preprint2010arXivOpen access
Emilio ElizaldeRatbay MyrzakulovValery V. ObukhovDiego Sáez-Gómez
gr-qc
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Emilio ElizaldeRatbay MyrzakulovValery V. ObukhovDiego Sáez-Gómez

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