Perturbations in bouncing cosmologies: dynamical attractor vs scale invariance

Details Perturbations in bouncing cosmologies: dynamical attractor vs scale invariance Perturbations in bouncing cosmologies: dynamical attractor vs scale invariance

2004-11-29

arxiv.org/abs/hep-th/0411270v1

Phys.Rev. D71 (2005) 063505

Physics

High Energy Physics

High Energy Physics - Theory

19 pages

Scientific paper

10.1103/PhysRevD.71.063505

For bouncing cosmologies such as the ekpyrotic/cyclic scenarios we show that it is possible to make predictions for density perturbations which are independent of the details of the bouncing phase. This can be achieved, as in inflationary cosmology, thanks to the existence of a dynamical attractor, which makes local observables equal to the unperturbed solution up to exponentially small terms. Assuming that the physics of the bounce is not extremely sensitive to these corrections, perturbations can be evolved even at non-linear level. The resulting spectrum is not scale invariant and thus incompatible with experimental data. This can be explicitly shown in synchronous gauge where, contrary to what happens in the commonly used Newtonian gauge, all perturbations remain small going towards the bounce and the existence of the attractor is manifest.

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