TL;DR
This paper reviews how accelerating four-dimensional universes can arise from higher-dimensional supergravity theories, highlighting conditions for transient and eternal acceleration, and discussing the implications of flux compactifications and the no-go theorem.
Contribution
It provides explicit constructions of flat cosmologies with exponential potentials and analyzes the conditions for transient and eternal acceleration in supergravity compactifications.
Findings
Transient acceleration is generic in flux compactifications.
Explicit flat cosmologies with exponential potentials are constructed.
An eternally accelerating universe without a future event horizon is presented.
Abstract
The status of accelerating four-dimensional universes obtained by time-dependent compactifications of 10 or 11 dimensional supergravity is reviewed, as is the `no-go' theorem that they evade. All flat cosmologies for a simple exponential potential are found explicitly. It is noted that transient acceleration is generic, and unavoidable for `flux' compactifications. Included is an eternally accelerating flat cosmology without a future event horizon.
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