Graceful Exit in String Cosmology
Ram Brustein, Richard Madden

TL;DR
This paper explores how classical and quantum corrections to string theory's effective action facilitate a smooth transition from early inflationary expansion to a standard cosmological phase, addressing the graceful exit problem.
Contribution
It demonstrates how specific classical and quantum corrections enable a stable high-curvature string phase and violation of energy conditions for a graceful exit in string cosmology.
Findings
Classical corrections stabilize high curvature phases.
Quantum corrections induce null energy condition violation.
A mechanism for transitioning to a decelerated universe is proposed.
Abstract
The graceful exit transition from a dilaton-driven inflationary phase to a decelerated Friedmann-Robertson-Walker era requires certain classical and quantum corrections to the string effective action. Classical corrections can stabilize a high curvature string phase while the evolution is still in the weakly coupled regime, and quantum corrections can induce violation of the null energy condition, allowing evolution towards a decelerated phase.
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