One-loop superstring cosmology and the nonsingular universe

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Abstract
We study the cosmological implications of the one-loop terms in the string expansion. In particular, we find non-singular solutions which interpolate between a contracting universe and an expanding universe, and show that these solutions provide a mechanism for removing the initial conditions problem peculiar to spatially closed FRW cosmologies. In addition, we perform numerical calculations to show that the non-singular cosmologies do not require a careful choice of initial conditions, and estimate the likely magnitude of higher order terms in the string expansion.Comment: 19 pages, 3 figures (postscript), Latex2e, discussion of curvature invariants added. To appear in Phys. Rev.