Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-05-03
Phys.Rev.D74:046004,2006
Physics
High Energy Physics
High Energy Physics - Theory
15 pages, 3 figures, minor changes, published version
Scientific paper
10.1103/PhysRevD.74.046004
In this paper we investigate the cosmological effects of modified gravity with string curvature corrections added to Einstein-Hilbert action in the presence of a dynamically evolving scalar field coupled to Riemann invariants. The scenario exhibits several features of cosmological interest for late universe. It is shown that higher order stringy corrections can lead to a class of dark energy models consistent with recent observations. The model can give rise to quintessence, deSitter or phantom dark energy, in last case without recourse to negative kinetic energy field. The detailed treatment of reconstruction program for general scalar-Gauss-Bonnet gravity is presented for any given cosmology. The explicit examples of reconstructed scalar potentials are given for accelerated (quintessence, cosmological constant or phantom) universe. Finally, the relation with modified $F(G)$ gravity is established on classical level and is extended to include third order terms on curvature.
Nojiri Shin'ichi
Odintsov Sergei D.
Sami M.
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