The Emergent Universe: inflationary cosmology with no singularity and no quantum gravity era

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  • 12 June 2003
Abstract
Observations indicate that the universe is effectively flat, but they do not rule out a closed universe. The role of positive curvature is negligible at late times, but can be crucial in the early universe. In particular, positive curvature allows for cosmologies that originate as Einstein static universes with radius above the Planck scale, and then inflate and later reheat to a hot big bang era. These cosmologies have no singularity, no "beginning of time", and no horizon problem, and they are described by classical general relativity throughout their history.

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