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PHYSICS LETTERS B
Volume 545, Issue 1-2, Pages 1-7Publisher
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DOI: 10.1016/S0370-2693(02)02554-6
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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. (C) 2002 Published by Elsevier Science B.V.
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