The warping of extra spaces accelerates the expansion of the universe
arXiv:1004.0254 · doi:10.1142/S0218271810018505
Abstract
Generic cosmological models derived from higher dimensional theories with warped extra dimensions have a nonzero cosmological constant-like term induced on the 3+1 space-time, or a physical 3-brane. In the scenario where this 3+1 space-time is an inflating de Sitter "brane" embedded in a higher-dimensional space-time, described by warped geometry, the 4D cosmological term is determined in terms of two length scales: one is a scale associated with the size of extra dimension(s) and the other is a scale associated with the warping of extra space(s). The existence of this term in four dimensions provides a tantalizing possibility of explaining the observed accelerating expansion of the universe from fundamental theories of gravity, e.g. string theory.
arXiv comment7 pages, no figure; Selected for an "Honorable Mention" (15 May 2010) in the Gravity Research Foundation 2010 Awards for Essays on Gravitation
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- Multidimensional gravitational model with anisotropic pressure
- Cosmology of a Friedmann-Lamaître-Robertson-Walker 3-brane, Late-Time Cosmic Acceleration, and the Cosmic Coincidence
- Five-dimensional warped product space-time with time-dependent warp factor and cosmology of the four-dimensional universe
- An Alternative Approach to the Exact Solution of FRW-Type Spacetime with a Generalized Chaplygin Gas
- We Probably Live On An Inflating Brane-World