Near-Horizon Solution for DGP Perturbations

Details Near-Horizon Solution for DGP Perturbations Near-Horizon Solution for DGP Perturbations

2006-06-13

arxiv.org/abs/astro-ph/0606285v2

Phys.Rev.D75:064002,2007

Astronomy and Astrophysics

Astrophysics

11 pages, 10 figures, changes to introduction reflect version accepted by PRD

Scientific paper

10.1103/PhysRevD.75.064002

We develop a scaling ansatz for the master equation in Dvali, Gabadadze, Porrati cosmologies, which allows us to solve the equations of motion for perturbations off the brane during periods when the on-brane evolution is scale-free. This allows us to understand the behavior of the gravitational potentials outside the horizon at high redshifts and close to the horizon today. We confirm that the results of Koyama and Maartens are valid at scales relevant for observations such as galaxy-ISW correlation. At larger scales, there is an additional suppression of the potential which reduces the growth rate even further and would strengthen the ISW effect.

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