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- W3099759332 abstract "In braneworld models, Spacetime-Matter and other Kaluza–Klein theories, our spacetime is devised as a four-dimensional hypersurface orthogonal to the extra dimension in a five-dimensional bulk. We show that the FRW line element can be reinvented on a dynamical four-dimensional hypersurface, which is not orthogonal to the extra dimension, without any internal contradiction. This hypersurface is selected by the requirement of continuity of the metric and depends explicitly on the evolution of the extra dimension. The main difference between the conventional FRW, on an orthogonal hypersurface, and the new one is that the latter contains higher-dimensional modifications to the regular matter density and pressure in 4D. We compare the evolution of the spacetime in these two interpretations and find that a wealth of new physics can be derived from a five-dimensional metric if it is interpreted on a dynamical (non-orthogonal) 4D hypersurface. In particular, in the context of a well-known cosmological metric in 5D, we construct a FRW model which is consistent with the late accelerated expansion of the universe, while fitting simultaneously the observational data for the deceleration parameter. The model predicts an effective equation of state for the universe, which is consistent with observations." @default.
- W3099759332 created "2020-11-23" @default.
- W3099759332 creator A5029984521 @default.
- W3099759332 date "2006-04-20" @default.
- W3099759332 modified "2023-10-16" @default.
- W3099759332 title "REINVENTING SPACETIME ON A DYNAMICAL HYPERSURFACE" @default.
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- W3099759332 doi "https://doi.org/10.1142/s0217732306020214" @default.
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