Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2011-06-19
Int. J. Mod. Phys. D20 (2011) 2809-2816
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
8 pages, latex (Essay received Honourable mention in Gravity Research Foundation essay competition 2011)
Scientific paper
10.1142/S0218271811020627
Brane-world models where observers are trapped within the thickness of a 3-brane offer novel perspectives on gravitation and cosmology. In this essay, I would argue that the problem of a late epoch acceleration of the universe is well explained in the framework of a 4-dimensional de Sitter universe embedded in a 5-dimensional de Sitter spacetime. While a 5D anti de Sitter space background is important for studying conformal field theories -- for its role in the AdS/CFT correspondence -- the existence of a 5-dimensional de Sitter space is crucial for finding an effective 4D Newton constant that remains finite and a normalizable zero-mode graviton wave function.
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