A nearly static 'lingering' phase before inflation is unstable, and the growth of perturbations during that phase could seed the transition to inflation and leave observable curvature or transplanckian signatures.
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Cosmological Perturbations from a New Approach to Inflation
A nearly static 'lingering' phase before inflation is unstable, and the growth of perturbations during that phase could seed the transition to inflation and leave observable curvature or transplanckian signatures.