# The Super-Planckian Axion Strikes Back

## TL;DR

This paper introduces a new framework for achieving large axion decay constants and trans-Planckian field excursions without tuning, using linked conformal field theories and warped geometries, applicable to inflation and axion models.

## Contribution

It proposes a novel, calculable model linking multiple CFTs via a common cutoff and gauged symmetry to realize large axion decay constants and field excursions.

## Key findings

- Framework enables large hierarchies in axion decay constants.
- Duality with warped space geometries allows calculability.
- Applicable to ultra-light axions, inflation, and relaxion models.

## Abstract

We present a novel framework for obtaining large hierarchies in axion decay constants as well as trans-Planckian field excursions, with no need for tuning or a large number of fields. We consider a model with two or more CFTs with a common cutoff, that are linked by a gauged diagonal symmetry. This construction is dual to the geometry of a warped space with two or more throats glued at a common brane, allowing for calculability. Many applications of our setup are possible,such as ultra-light axions, natural inflation, and relaxion models.