Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-01-29
ECONF C0602061:06,2006; Int.J.Geom.Meth.Mod.Phys.4:115-146,2007
Physics
High Energy Physics
High Energy Physics - Theory
LaTeX file, 21 pages, references are added, lectures for 42 Karpacz Winter School on Theor Physics
Scientific paper
10.1142/S0219887807001928
We review various modified gravities considered as gravitational alternative for dark energy. Specifically, we consider the versions of $f(R)$, $f(G)$ or $f(R,G)$ gravity, model with non-linear gravitational coupling or string-inspired model with Gauss-Bonnet-dilaton coupling in the late universe where they lead to cosmic speed-up. It is shown that some of such theories may pass the Solar System tests. On the same time, it is demonstrated that they have quite rich cosmological structure: they may naturally describe the effective (cosmological constant, quintessence or phantom) late-time era with a possible transition from decceleration to acceleration thanks to gravitational terms which increase with scalar curvature decrease. The possibility to explain the coincidence problem as the manifestation of the universe expansion in such models is mentioned. The late (phantom or quintessence) universe filled with dark fluid with inhomogeneous equation of state (where inhomogeneous terms are originated from the modified gravity) is also described.
Nojiri Shin'ich
Odintsov Sergei D.
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