Understand
We describe new no-go theorems for producing four-dimensional accelerating universes from warped dimensional reduction.
- The new theorems improve upon previous results by including dynamical extra dimensions and by treating four-dimensional universes that are not precisely de Sitter.
- The theorems show there exists a threshold four-dimensional equation-of-state parameter w below which the number of e-foldings of expansion is bounded, and give expressions for the maximum number of allowed e-foldings.
- In the generic case, the bound must be satisfied if the higher-dimensional theory satisfies the strong energy condition.
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