2008

New no-go theorems for cosmic acceleration with extra dimensions

Wesley, Daniel H.

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.

Built on

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  • A. G. Riess et al

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  • M. Cvetic, H. Lu and C. N. Pope, Phys. Rev. D 62

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  • D. H. Wesley, arXiv:0802.3214 [hep-th]

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  • K. Koyama, arXiv:0709.2399 [hep-th]

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Then

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