Aligned Natural Inflation: Monodromies of two Axions

Abstract

Natural (axionic) inflation can accommodate sizeable primordial tensor modes but suffers from the necessity of trans-Planckian variations of the inflaton field. This problem can be solved via the mechanism of aligned axions arXiv:hep-ph/0409138, where the aligned axion spirals down in the potential of other axions. We elaborate on the mechanism in view of the recently reported observations of the BICEP2 collaboration arXiv:1403.3985.

11 pages, 3 figures, v2: typos corrected, references added, v3: references added, matches published version

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• Hierarchical Axion Inflation
• Can Gravitational Instantons Really Constrain Axion Inflation?
• Axion Monodromy Inflation on Warped Throats
• Axion Landscape and Natural Inflation
• Combining Universal and Odd RR Axions for Aligned Natural Inflation
• Axion monodromy inflation with multi-natural modulations
• Large Field Inflation from Axion Mixing
• Three-form multiplet and Inflation
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• Natural Inflation and Low Energy Supersymmetry
• Helical Inflation and Cosmic Strings
• Inflation that runs naturally: Gravitational waves and suppression of power at large and small scales
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• Grand Unification and Subcritical Hybrid Inflation
• Natural Inflation from Near Alignment in Heterotic String Theory
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• Perspective on completing natural inflation
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• Signatures of Planck Corrections in a Spiralling Axion Inflation Model
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