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Title: Higher dimensional cosmology: the cosmology of the DGP model
Authors: NG KAH FEE
Keywords: Higher dimensional cosmology, DGP model, cosmological model, general relativity, observational test, analytic marginalization
Issue Date: 6-Aug-2013
Source: NG KAH FEE (2013-08-06). Higher dimensional cosmology: the cosmology of the DGP model. ScholarBank@NUS Repository.
Abstract: In recent years, observations suggest that our universe is expanding in an accelerating manner. In year 2000, Dvali, Gabadadze and Porrati, in the direction of modifying gravity, came up with an interesting model that utilizes extra dimensions to explain this phenomenon. In this model, all the matter and energy are con strained in a 3D brane and the action governing the gravitational interaction is the normal 5D Hilbert-Einstein action with an extra 4D copy. This extra 4D action will ensure that on smaller scales like that of the solar system, the action will act like a 4D Hilbert-Einstein action which is equivalent to the General Relativity, so the extra spatial dimension will not be detected. On the other hand on larger scales, the action will be dominated by the 5D term, so the model will act like a true 5D model which expands faster than a 4D model and thus provides the acceleration required.
Appears in Collections:Master's Theses (Open)

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