Abstract
For primordial black holes (PBH) to be the dark matter in single-field inflation, the slow-roll approximation must be violated by at least in order to enhance the curvature power spectrum within the required number of -folds between cosmic microwave background scales and PBH mass scales. Power spectrum predictions which rely on the inflaton remaining on the slow-roll attractor can fail dramatically leading to qualitatively incorrect conclusions in models like an inflection potential and misestimate the mass scale in a running mass model. We show that an optimized temporal evaluation of the Hubble slow-roll parameters to second order remains a good description for a wide range of PBH formation models where up to a amplification of power occurs in 10 -folds or more.
- Received 29 June 2017
DOI:https://doi.org/10.1103/PhysRevD.96.063503
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