Geometrical destabilization, premature end of inflation and Bayesian model selection

Sébastien Renaux-Petel, Krzysztof Turzyński, Vincent Vennin

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Abstract

By means of Bayesian techniques, we study how a premature ending of inflation, motivated by geometrical destabilization, affects the observational evidences of typical inflationary models. Large-field models are worsened, and inflection point potentials are drastically improved for a specific range of the field-space curvature characterizing the geometrical destabilization. For other models we observe shifts in the preferred values of the model parameters. For quartic hilltop models for instance, contrary to the standard case, we find preference for theoretically natural sub-Planckian hill widths. Eventually, the Bayesian ranking of models becomes substantially reordered with a premature end of inflation. Such a phenomenon also modifies the constraints on the reheating expansion history, which has to be properly accounted for since it determines the position of the observational window with respect to the end of inflation. Our results demonstrate how the interpretation of cosmological data in terms of fundamental physics is considerably modified in the presence of premature end of inflation mechanisms.

Original languageEnglish
Article number006
JournalJournal of Cosmology and Astroparticle Physics
Volume2017
Issue number11
DOIs
Publication statusPublished - 6 Nov 2017

Keywords

  • inflation
  • physics of the early universe
  • RCUK
  • STFC
  • ST/K00090X/1
  • ST/N000668/1

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