Evidence for Inflation in an Axion Landscape
Pran Nath, Maksim Piskunov

TL;DR
This paper proposes a supersymmetric axion landscape inflation model where a single axion acts as the inflaton, achieving compatibility with Planck data and allowing sub-Planckian decay constants through a novel fast-slow roll splitting mechanism.
Contribution
The paper introduces a new inflation model within supersymmetry featuring an axion landscape with a fast-slow roll splitting, enabling sub-Planckian decay constants and consistency with observational data.
Findings
Inflation compatible with Planck data achieved.
Sub-Planckian axion decay constants are possible.
A novel fast-slow roll splitting mechanism is proposed.
Abstract
We discuss inflation models within supersymmetry and supergravity frameworks with a landscape of chiral superfields and one shift symmetry which is broken by non-perturbative symmetry breaking terms in the superpotential. We label the pseudo scalar component of the chiral fields axions and their real parts saxions. Thus in the models only one combination of axions will be a pseudo-Nambu-Goldstone-boson which will act as the inflaton. The proposed models constitute consistent inflation for the following reasons: The inflation potential arises dynamically with stabilized saxions, the axion decay constant can lie in the sub-Planckian region, and consistency with the Planck data is achieved. The axion landscape consisting of axion pairs is assumed with the axions in each pair having opposite charges. A fast roll--slow roll splitting mechanism for the axion potential is proposed…
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