Reconstruction and deceleration-acceleration transitions in modified gravity

Details Reconstruction and deceleration-acceleration transitions in modified gravity Reconstruction and deceleration-acceleration transitions in modified gravity

2009-12-13

arxiv.org/abs/0912.2488v3

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX 8 pages, published version.

Scientific paper

We discuss the cosmological reconstruction in modified Gauss-Bonnet and F(R) gravities. Two alternative representations of the action (with and without auxiliary scalar) are considered. The approximate description of deceleration-acceleration transition cosmologies is reconstructed. It is shown that cosmological solution containing Big Bang and Big Rip singularities may be reconstructed only using the representation with the auxiliary field. The analytical description of the deceleration-acceleration transition cosmology in modified Gauss-Bonnet gravity is demonstrated to be impossible at sufficiently general conditions.

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