Axion monodromy inflation with multi-natural modulations

Tetsutaro Higaki, Tatsuo Kobayashi, Osamu Seto, Yuya Yamaguchi

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We study parameter space in the axion monodromy inflation corrected by dynamically generated terms involving with the axion. The potential has the linear term with multiple sinusoidal functions, which play a role in generating modulations. We show that this potential leads both to a large tensor-to-scalar ratio rT ∼ 0.16 and to a large negative running of spectral index αs ∼ - (0.02 -0.03), ameliorating the tension between the result of the PLANCK and that of the BICEP2. To realize these results, a small hierarchy among dynamical scales is required whereas the decay constants in sinusoidal functions remain sub-Planckian in this model. We discuss also reheating process after the inflation in a bottom-up approach.

Original languageEnglish
Article number025
JournalJournal of Cosmology and Astroparticle Physics
Volume2014
Issue number10
DOIs
Publication statusPublished - 2014 Oct 1
Externally publishedYes

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modulation
hierarchies
tensors
scalars
heating
decay

Keywords

  • axions
  • inflation
  • string theory and cosmology

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

Axion monodromy inflation with multi-natural modulations. / Higaki, Tetsutaro; Kobayashi, Tatsuo; Seto, Osamu; Yamaguchi, Yuya.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2014, No. 10, 025, 01.10.2014.

Research output: Contribution to journalArticle

Higaki, Tetsutaro ; Kobayashi, Tatsuo ; Seto, Osamu ; Yamaguchi, Yuya. / Axion monodromy inflation with multi-natural modulations. In: Journal of Cosmology and Astroparticle Physics. 2014 ; Vol. 2014, No. 10.
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