# A Kaluza-Klein Approach to Double and Exceptional Field Theory

## TL;DR

This paper explores a Kaluza-Klein inspired framework for understanding double and exceptional field theories, emphasizing the geometric and physical implications for supergravity, string, and M-theory.

## Contribution

It introduces a Kaluza-Klein perspective to unify fields in supergravity within double and exceptional field theories, highlighting charged states and extended geometries.

## Key findings

- Identification of charged states via Kaluza-Klein intuition
- Reinterpretation of central charges in extended geometry
- Description of extended geometry as a generalised phase space

## Abstract

We examine the challenge of viewing all the fields in supergravity as arising from a Kaluza-Klein like dimensional reduction of some higher-dimensional theory. This gives rise to what is known as exceptional field theory or double field theory. A particular emphasis is placed on following the Kaluza-Klein intuition leading to the identification of charged states and a reinterpretation of the central charges. We further give a description of the novel extended geometry as a generalised phase space and the relationship to string and M-theory theory and the notion of quantization