Assisted Contraction

Details Assisted Contraction Assisted Contraction

2002-06-13

arxiv.org/abs/hep-th/0206112v2

Phys.Lett. B545 (2002) 1-7

Physics

High Energy Physics

High Energy Physics - Theory

13 pages, 3 figures, revised version, conclusions unchanged

Scientific paper

10.1016/S0370-2693(02)02554-6

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.

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