Perturbations in a Bouncing Brane Model

Details Perturbations in a Bouncing Brane Model Perturbations in a Bouncing Brane Model

2004-01-04

arxiv.org/abs/hep-th/0401010v3

Phys.Rev. D70 (2004) 066006

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, minor modifications, a few typos corrected

Scientific paper

10.1103/PhysRevD.70.066006

The question of how perturbations evolve through a bounce in the Cyclic and Ekpyrotic models of the Universe is still a matter of ongoing debate. In this report we show that the collision between boundary branes is in most cases singular even in the full 5-D formalism, and that first order perturbation theory breaks down for at least one perturbation variable. Only in the case that the boundary branes approach each other with constant velocity shortly before the bounce, can a consistent, non singular solution be found. It is then possible to follow the perturbations explicitly until the actual collision. In this case, we find that if a scale invariant spectrum developed on the hidden brane, it will get transferred to the visible brane during the bounce.

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