Looking for an extra dimension with tomographic cosmic shear

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  • 25 July 2004
Abstract
The Dvali, Gabadadze and Porrati model (DGP) is an alternative to dark energy (DE) to explain cosmic acceleration by modified gravity due to the presence of an extra dimension. Growth factors are different in the two models when one adjusts parameters to get nearly identical H(z). The two models could be distinguished with independent determinations of both geometrical factors and the growth factor. We introduce new parameterizations to separate the influence of geometry and the influence of growth on cosmic shear maps. We find that future observations will be able to distinguish between DE and DGP.

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