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Resonant reconciliation of convex-potential inflation models and the Planck data

Abolhasani, A. A ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevD.100.103505
  3. Publisher: American Physical Society , 2019
  4. Abstract:
  5. We consider single field chaotic inflationary models plus a cosine modulation term, as in axion monodromy models, and augment them by a light scalar field with similar cosine coupling. We show that the power spectrum of curvature perturbations of this model is dominated by the one-loop contribution to the inflaton two-point function which is enhanced due to resonant interactions. This allows us to disentangle the scale of the scalar and tensor perturbations and hence, to suppress the ratio of tensor-to-scalar power spectra and alter the expression of the scalar spectral tilt from the simple chaotic models. Thus, our resonating module opens the way to reconcile chaotic models with convex potential and the Planck data. As in monodromy inflation models, we also have a cosine modulation in the spectral tilt. We mention that the contribution of resonance effects to non-Gaussianty is small and it remains within the current bounds. Resonant production of light particles toward the end of inflation may set the stage for a successful reheating model. © 2019 American Physical Society
  6. Keywords:
  8. Source: Physical Review D ; Volume 100, Issue 10 , 2019 ; 24700010 (ISSN)
  9. URL: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.100.103505