Kaluza-Kelin Higher Derivative Gravity and Friedmann-Robertson-Walker Cosmology

Details Kaluza-Kelin Higher Derivative Gravity and Friedmann-Robertson-Walker Cosmology Kaluza-Kelin Higher Derivative Gravity and Friedmann-Robertson-Walker Cosmology

2000-06-15

arxiv.org/abs/hep-th/0006110v2

Physics

High Energy Physics

High Energy Physics - Theory

9 pages, new references added, some typos and errors corrected

Scientific paper

Kaluza-Klein approach in an N(=1+3+D)-dimensional Friedmann-Robertson-Walker type space is often adopted in the literature. We derive a compact expression for the Friedmann equation in a (1+3+D)-dimensional space. The redundancy of the associated field equations due to the Bianchi identity is analyzed. We also study the dilaton gravity theory with higher-derivative gravitational couplings. It turns out that higher-order terms will not affect the Friedmann equation in a constant flat internal space. This is true only for the flat-De Sitter external space. The inflationary solution in an induced-gravity model is also discussed as an application.

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