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Primordial black holes and inflation from double-well potentials

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published
  • Alexandros Karam
  • Niko Koivunen
  • Eemeli Tomberg
  • Antonio Racioppi
  • Hardi Veermäe
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Article number002
<mark>Journal publication date</mark>1/09/2023
<mark>Journal</mark>Journal of Cosmology and Astroparticle Physics
Issue number9
Volume2023
Publication StatusPublished
<mark>Original language</mark>English

Abstract

We investigate the formation of large peaks in the inflationary curvature power spectrum from double-well potentials. In such scenarios, the initial CMB spectrum is created at large field values. Subsequently, the inflaton will cross one of the minima and will decelerate rapidly as it reaches the local maximum at the origin, either falling back or crossing it. During this final phase, a significant peak in the curvature power spectrum can be generated. Our analysis reveals that this class of models produces more pronounced peaks than most quasi-inflection point scenarios with less tuning for the model parameters. Finally, we construct an explicit theoretically motivated inflationary scenario that is consistent with the latest CMB observations and capable of generating sufficiently large curvature perturbations for primordial black holes.