Journal
PHYSICS LETTERS B
Volume 568, Issue 1-2, Pages 1-7Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2003.06.004
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We present a phase-space analysis of cosmology containing multiple scalar fields with positive and negative exponential potentials. We show that there exist power-law multi-kinetic-potential scaling solutions for sufficiently flat positive potentials or steep negative potentials. The former is the unique late-time attractor and the well-known assisted inflationary solution, but the later is never unstable in an expanding universe. Moreover, for steep negative potentials there exist a kinetic-dominated regime in which each solution is a late-time attractor. We briefly discuss the physical consequences of these results. (C) 2003 Published by Elsevier B.V.
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