# Gauged Galileons

## TL;DR

This paper develops a systematic method to gauge galileon symmetries, leading to a novel construction of massive gravity and an extended theory involving a traceless symmetric field, free of quadratic order pathologies.

## Contribution

It introduces a coset-based gauging procedure for galileon symmetries, recovering massive gravity and extending to a new coupled spin-2 and traceless field theory.

## Key findings

- Recovered massive gravity via gauging galileon symmetry
- Extended to a special galileon with a traceless symmetric field
- The extended theory is free of quadratic order pathologies around flat space

## Abstract

We discuss the gauging of non-linearly realized symmetries as a method to systematically construct spontaneously broken gauge theories. We focus in particular on galileon fields and, using a coset construction, we show how to recover massive gravity by gauging the galileon symmetry. We then extend our procedure to the special galileon, and obtain a theory that couples a massive spin-2 field with a traceless symmetric field, and is free of pathologies at quadratic order around flat space.