Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-05-17
Class. Quant. Grav. 26: 195008, 2009
Physics
High Energy Physics
High Energy Physics - Theory
7 pages; extended (from journal) version, minor typos fixed, refs added
Scientific paper
10.1088/0264-9381/26/19/195008
Accelerating universe or the existence of a small and positive cosmological constant is probably the most pressing obstacle as well as opportunity to significantly improving the models of four-dimensional cosmology from fundamental theories of gravity, including string theory. In seeking to resolve this problem, one naturally wonders if the real world can somehow be interpreted as an inflating de Sitter brane embedded in a higher-dimensional spacetime described by warped geometry. In this scenario, the four-dimensional cosmological constant may be uniquely determined in terms of two length scales: one is a scale associated with the size of extra dimensions and the other is a scale associated with the expansion rate of our universe. In some specific cases, these two scales are complementary to each other. This result is demonstrated here by presenting some explicit and completely non-singular de Sitter space dS$_4$ solutions of vacuum Einstein equations in five and ten dimensions.
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