Accelerating cosmologies from non-local higher-derivative gravity

Details Accelerating cosmologies from non-local higher-derivative gravity Accelerating cosmologies from non-local higher-derivative gravity

2008-09-09

arxiv.org/abs/0809.1535v2

Phys.Lett.B671:193-198,2009

Physics

High Energy Physics

High Energy Physics - Theory

7 pages, no figures, version to appear in Physics Letters B

Scientific paper

10.1016/j.physletb.2008.11.060

We study accelerating cosmological solutions of a general class of non-linear gravities which depend on Gauss-Bonnet and other higher derivative invariants. To achieve this goal a local formulation with auxiliary scalars for arbitrary higher-derivative non-local gravity is developed. It is demonstrated that non-local Gauss-Bonnet gravity can be reduced, in the local formulation, to a model of string-inspired scalar-Gauss-Bonnet gravity. A natural unification, in the theory here developed, of the early-time inflation epoch with a late-time acceleration stage can also be realized.

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