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Axion monodromy inflation with multi-natural modulations

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Title: Axion monodromy inflation with multi-natural modulations
Authors: Higaki, Tetsutaro Browse this author
Kobayashi, Tatsuo Browse this author →KAKEN DB
Seto, Osamu Browse this author →KAKEN DB
Yamaguchi, Yuya Browse this author
Keywords: axion
string theory and cosmology
Issue Date: Oct-2014
Publisher: IOP Publishing
Journal Title: Journal of cosmology and astroparticle physics
Volume: 2014
Issue: 10
Start Page: 25
Publisher DOI: 10.1088/1475-7516/2014/10/025
Abstract: We study parameter space in the axion monodromy inflation corrected by nautically 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 r(T) similar to 0.16 and to a large negative running of spectral index alpha(s) similar to -(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.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 小林 達夫

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