A contracting universe driven by two scalar fields

被引：87

作者：

Finelli, F ^{[1
]}

机构：

[1] CNR, IASF, Sez Bologna, I-40129 Bologna, Italy

来源：

PHYSICS LETTERS B | 2002年 / 545卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(02)02554-6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：1 / 7

页数：7

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