Journal
CLASSICAL AND QUANTUM GRAVITY
Volume 27, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/27/9/095007
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Funding
- MICINN (Spain) [FIS2006-02842]
- MEC (Spain) [PR2009-0314]
- AGAUR (Generalitat de Catalunya) [2009SGR-994]
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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 of describing 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 Lambda CDM cosmological era without any need for a cosmological constant. The specific properties of these theories of gravity in different particular cases, such as the de Sitter one, are studied.
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