paper

Cosmological Scaling Solutions and Multiple Exponential Potentials

arXiv:hep-th/0304048 · doi:10.1016/j.physletb.2003.06.004

Abstract

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.

8 pages, LaTeX2e, to appear in Phys.Lett.B

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