Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 64, Issue 3, Pages 483-494Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-009-1154-4
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Funding
- European Science Foundation (ESF) [2262]
- INFN (Italy)-DGICYT (Spain)
- MEC (Spain) [FIS2006-02842, PIE2007-50/023]
- AGAUR (Generalitat de Catalunya) [2005SGR-00790]
- Nagoya University
- Japan Society for the Promotion of Science [G07]
- ICREA Funding Source: Custom
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We discuss the classical and quantum properties of non-local modified Gauss-Bonnet gravity in de Sitter space, using its equivalent representation via string-inspired local scalar-Gauss-Bonnet gravity with a scalar potential. A classical, multiple de Sitter universe solution is found where one of the de Sitter phases corresponds to the primordial inflationary epoch, while the other de Sitter space solution-the one with the smallest Hubble rate-describes the late-time acceleration of our universe. A Chameleon scenario for the theory under investigation is developed, and it is successfully used to show that the theory complies with gravitational tests. An explicit expression for the one-loop effective action for this non-local modified Gauss-Bonnet gravity in the de Sitter space is obtained. It is argued that this effective action might be an important step towards the solution of the cosmological constant problem.
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