TL;DR
This paper presents a natural inflation model where the inflaton is a combination of gauge field components, achieving a super-Planckian decay constant and specific predictions for tensor-to-scalar ratio and reheating temperature.
Contribution
It introduces a novel milli-charge mechanism via a seesaw in a five-dimensional gauge theory to realize natural inflation with a super-Planckian decay constant.
Findings
Tensor-to-scalar ratio r between 0.033 and 0.125
Reheating temperature around 10^11 GeV
Inflaton decay constant above the Planck scale
Abstract
We construct a natural inflation model with the inflaton as a linear combination of the fifth components of Abelian gauge fields in a five-dimensional theory. A seesaw mechanism is introduced to provide a natural milli-charge for matter fields under one combination of the gauge symmetries. As a result, the effective decay constant of the inflaton field can be above the Planck scale with all scales in the model below the Planck scale. Our model predicts a tensor-to-scalar ratio r between 0.033 and 0.125 for sixty e-folds and a reheating temperature of a few 10^11 GeV.
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