In 1999, Lisa Randall and Raman Sundrumpresented a five-dimensional model for our universe [RS99b, RS99a]. They imagined our four-dimensional world as a brane-world or a surface layer in a five-dimensional bulk. This bulk may be infinite in size, but due to the special properties of the bulk the gravitational fields are effectively localised to the brane. The other standard model fields are confined to the brane; only gravity is allowed to propagate in the fifth dimension.
KeywordsCosmological Constant Extra Dimension Hubble Parameter Planck Scale Weyl Tensor
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