Axion monodromy inflation with multi-natural modulations


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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/57805

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
	inflation
	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.
Rights:	http://creativecommons.org/licenses/by/3.0/
Type:	article
URI:	http://hdl.handle.net/2115/57805
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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