Vector Perturbations in a Contracting Universe
High Energy Physics - Theory
2007-05-23 v3 Astrophysics
General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
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.
Cite
@article{arxiv.hep-th/0406180,
title = {Vector Perturbations in a Contracting Universe},
author = {Thorsten Battefeld and Robert Brandenberger},
journal= {arXiv preprint arXiv:hep-th/0406180},
year = {2007}
}
Comments
v3. Two reference added; Identical with version accepted for publication at PRD