Assisted Contraction
High Energy Physics - Theory
2009-11-07 v2
Abstract
We consider the dynamics of a contracting universe ruled by two minimally coupled scalar fields with general exponential potentials. This model describes string-inspired scenarios in the Einstein frame. Both background and perturbations can be solved analytically in this model. Curvature perturbations are generated with a scale invariant spectrum only for a dust-like collapse, as happens for a single field model with an exponential potential. We find the conditions for which a scale invariant spectrum for isocurvature perturbation is generated.
Cite
@article{arxiv.hep-th/0206112,
title = {Assisted Contraction},
author = {Fabio Finelli},
journal= {arXiv preprint arXiv:hep-th/0206112},
year = {2009}
}
Comments
13 pages, 3 figures, revised version, conclusions unchanged