Vector Perturbations in a Contracting Universe

Details Vector Perturbations in a Contracting Universe Vector Perturbations in a Contracting Universe

2004-06-21

arxiv.org/abs/hep-th/0406180v3

Phys.Rev. D70 (2004) 121302

Physics

High Energy Physics

High Energy Physics - Theory

v3. Two reference added; Identical with version accepted for publication at PRD

Scientific paper

10.1103/PhysRevD.70.121302

In this note we show that vector perturbations exhibit growing mode solutions in a contracting Universe, such as the contracting phase of the Pre Big Bang or the Cyclic/Ekpyrotic models of the Universe. This is not a gauge artifact and will in general lead to the breakdown of perturbation theory -- a severe problem that has to be addressed in any bouncing model. We also comment on the possibility of explaining, by means of primordial vector perturbations, the existence of the observed large scale magnetic fields. This is possible since they can be seeded by vorticity.

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