Arithmetic Gauge Theory: A Brief Introduction

TL;DR

This paper introduces the arithmetic geometry of principal bundles, highlighting analogies with quantum field theory and exploring their role in understanding rational points and Galois representations.

Contribution

It offers an accessible overview connecting arithmetic principal bundles with concepts from physics and quantum field theory, emphasizing elementary analogies and standard constructions.

Findings

Highlights the relation between moduli spaces of principal bundles and Faltings's theorem

Explores Galois representations in the context of arithmetic geometry

Draws analogies between arithmetic moduli spaces and quantum field theory

Abstract

Much of arithmetic geometry is concerned with the study of principal bundles. They occur prominently in the arithmetic of elliptic curves and, more recently, in the study of the Diophantine geometry of curves of higher genus. In particular, the geometry of moduli spaces of principal bundles appears to be closely related to an effective version of Faltings's theorem on finiteness of rational points on curves of genus at least 2. The study of arithmetic principal bundles includes the study of {\em Galois representations}, the structures linking motives to automorphic forms according to the Langlands programme. In this article, we give a brief introduction to the arithmetic geometry of principal bundles with emphasis on some elementary analogies between arithmetic moduli spaces and the constructions of quantum field theory. For the most part, it can be read as an attempt to explain standard constructions of arithmetic geometry using the language of physics, albeit employed in an amateurish and ad hoc manner.