Electrodynamics from Noncommutative Geometry

TL;DR

This paper demonstrates how noncommutative geometry can be used to derive electrodynamics, including U(1) gauge theory, from spectral triples, extending the framework's application to abelian gauge theories.

Contribution

It introduces a simple commutative spectral triple that models electrodynamics, overcoming previous limitations of noncommutative geometry in describing abelian gauge theories.

Findings

A spectral triple based on the two-point space yields a U(1) gauge theory.

Modified spectral triples can produce the classical electrodynamics on curved backgrounds.

The approach extends noncommutative geometry's applicability to abelian gauge theories.

Abstract

Within the framework of Connes' noncommutative geometry, the notion of an almost commutative manifold can be used to describe field theories on compact Riemannian spin manifolds. The most notable example is the derivation of the Standard Model of high energy physics from a suitably chosen almost commutative manifold. In contrast to such a non-abelian gauge theory, it has long been thought impossible to describe an abelian gauge theory within this framework. The purpose of this paper is to improve on this point. We provide a simple example of a commutative spectral triple based on the two-point space, and show that it yields a U(1) gauge theory. Then, we slightly modify the spectral triple such that we obtain the full classical theory of electrodynamics on a curved background manifold.