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D. H. Lyth, “The hybrid inflation waterfall and the primordial curvature perturbation,” JCAP
Original
2012
Cited alongside, same era.
C. T. Byrnes, E. J. Copeland, and A. M. Green, “Primordial black holes as a tool for constraining non-Gaussianity,” Phys. Rev. D
Original
2012
Cited alongside, same era.
Planck Collaboration
Original
2013
Cited alongside, same era.
E. Dimastrogiovanni and M. Peloso, “Stability analysis of chromo-natural inflation and possible evasion of Lyth’s bound,” Phys. Rev
Original
2013
Cited alongside, same era.
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Then

J. Garcia-Bellido, M. Peloso, and C. Unal, “Gravitational waves at interferometer scales and primordial black holes in axion inflation,” JCAP
Original
2016
Later among the works it cites.
R. Namba, M. Peloso, M. Shiraishi, L. Sorbo, and C. Unal, “Scale-dependent gravitational waves from a rolling axion,” JCAP
Original
2016
Later among the works it cites.
S. Parameswaran, G. Tasinato, and I. Zavala, “Subleading Effects and the Field Range in Axion Inflation,” JCAP
Original
2016
Later among the works it cites.
T. Kobayashi, A. Oikawa, and H. Otsuka, “New potentials for string axion inflation,” Phys. Rev
Original
2016
Later among the works it cites.
N. Cabo Bizet, O. Loaiza-Brito, and I. Zavala, “Mirror quintic vacua: hierarchies and inflation,” JHEP

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2020

Synthetic Gravitational Waves from a Rolling Axion Monodromy

Özsoy, Ogan

Understand

In string theory inspired models of axion-like fields, sub-leading non-perturbative effects, if sufficiently large, can introduce steep cliffs and gentle plateaus onto the underlying scalar potential.

During inflation, the motion of a spectator axion $\sigma$ on this potential becomes temporarily fast, leading to localized amplification of one helicity state of gauge fields.
In this model, the tensor and scalar correlators sourced by the vector fields exhibit localized peak(s) in momentum space corresponding to the modes that exit the horizon while the roll of $\sigma$ is fast.
Thanks to the gravitational coupling of gauge fields with the visible sector and the localized nature of particle production, this model can generate observable gravitational waves (GWs) at CMB scales while satisfying the current limits on scalar perturbations.