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  • 1475-7516_2015_01_018

    Rights statement: Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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A minimal sub-Planckian axion inflation model with large tensor-to-scalar ratio

Research output: Contribution to journalJournal article

Published
Article number018
<mark>Journal publication date</mark>01/2015
<mark>Journal</mark>Journal of Cosmology and Astroparticle Physics
Issue number1
Volume2015
Number of pages8
Publication statusPublished
Original languageEnglish

Abstract

We present a minimal axion inflation model which can generate a large tensor-to-scalar ratio while remaining sub-Planckian. The modulus of a complex scalar field Phi with a lambda vertical bar Phi vertical bar(4) potential couples directly to the gauge field of a strongly-coupled sector via a term of the form (vertical bar Phi vertical bar/M-Pl)(m) F (F) over tilde . This generates a minimum of the potential which is aperiodic in the phase. The resulting inflation model is equivalent to a phi(4/(m+1)) chaotic inflation model. For the natural case of a leading-order portal-like interaction of the form Phi dagger Phi F (F) over tilde, the model is equivalent to a phi(4/3) chaotic inflation model and predicts a tensor-to-scalar ratio r = 16/3N = 0.097 and a scalar spectral index n(s) = 1 - 5/3N = 0.970 . The value of vertical bar Phi vertical bar remains sub-Planckian throughout the observable era of inflation, with vertical bar Phi vertical bar less than or similar to 0.01M(Pl) for N less than or similar to 60 when lambda similar to 1.

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Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.