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2014

Hierarchical Axion Inflation

Ben-Dayan, Ido, Pedro, Francisco Gil, Westphal, Alexander

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We propose a new field theory mechanism for generating an effective trans-Planckian decay constant from sub-Planckian ones.

Using the minimal two axions and a hierarchy between two axion decay constants is sufficient for realizing inflation through non-perturbative effects only and with minimal tuning.
The inflationary motion is kept entirely within a sub-Planckian domain.
We outline possible strategies of embedding the model in a string theory setup.

Hierarchical Axion Inflation · Around

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N. Arkani-Hamed, H. -C. Cheng, P. Creminelli and L. Randall, “Extra natural inflation,” Phys. Rev. Lett. 90
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J. E. Kim, H. P. Nilles and M. Peloso, “Completing natural inflation,” JCAP 0501
Original
2005
Earlier work this paper cites.

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R. Kallosh, N. Sivanandam and M. Soroush, “Axion Inflation and Gravity Waves in String Theory,” Phys. Rev. D 77
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E. Silverstein and A. Westphal, “Monodromy in the CMB: Gravity Waves and String Inflation,” Phys. Rev. D 78
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M. Berg, E. Pajer and S. Sjors, “Dante’s Inferno,” Phys. Rev. D 81
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P. A. R. Ade et al
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D. Baumann and L. McAllister, “Inflation and String Theory,” arXiv:1404.2601 [hep-th]
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K. Choi, H. Kim and S. Yun, “Natural Inflation with Multiple Sub-Planckian Axions,” arXiv:1404.6209 [hep-th]
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T. Higaki and F. Takahashi, “Natural and Multi-Natural Inflation in Axion Landscape,” arXiv:1404.6923 [hep-th]
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R. Kallosh, A. Linde and B. Vercnocke, “Natural Inflation in Supergravity and Beyond,” arXiv:1404.6244 [hep-th]
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I. Ben-Dayan, F. G. Pedro, A. Westphal, to appear
Cited in the paper.
S. -H. H. Tye and S. S. C. Wong, “Helical Inflation and Cosmic Strings,” arXiv:1404.6988 [astro-ph.CO]
Original
Cited in the paper.

Then

G. Hinshaw et al
Original
2013
Later among the works it cites.
DESY Physics Seminar, April 22, 2014 A. Westphal: ”Gravitational Waves from the Big Bang - Inflation in String Theory after BICEP2”, slide 30; http://indico.desy.de/conferenceDisplay.py?confId=9911
2014
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