Journal
PHYSICS OF THE DARK UNIVERSE
Volume 18, Issue -, Pages 6-10Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.dark.2017.09.001
Keywords
Inflation; Primordial black holes; Dark matter
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Funding
- Ramon y Cajal program
- Unidad de Excelencia Maria de Maeztu [MDM-2014-0369, FPA2013-46570-C2-2-P]
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Recently, it has been claimed that inflationary models with an inflection point in the scalar potential can produce a large resonance in the power spectrum of curvature perturbation. In this paper however we show that the previous analyses are incorrect. The reason is twofold: firstly, the inflaton is over-shot from a stage of standard inflation and so deviates from the slow-roll attractor before reaching the inflection. Secondly, on the (or close to) the inflection point, the ultra-slow-roll trajectory supersede the slow-roll one and thus, the slow-roll approximations used in the literature cannot be used. We then reconsider the model and provide a recipe for how to produce nevertheless a large peak in the matter power spectrum via fine-tuning of parameters. (C) 2017 Elsevier B.V. All rights reserved.
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