Hierarchical Axion Inflation
Ido Ben-Dayan, Francisco Gil Pedro, Alexander Westphal

TL;DR
This paper introduces a novel two-axion inflation model that achieves an effective trans-Planckian decay constant from sub-Planckian parameters, enabling inflation within a sub-Planckian field space with minimal tuning.
Contribution
It presents a new mechanism using two axions and hierarchical decay constants to realize inflation without super-Planckian field excursions, compatible with string theory embeddings.
Findings
Effective trans-Planckian decay constant generated from sub-Planckian parameters
Inflation occurs entirely within a sub-Planckian domain
Minimal tuning required for the model
Abstract
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.
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