A PDE approach to the 2D Yang-Mills measure

Ilya Chevyrev; Tom Klose; Abdulwahab Mohamed

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arXiv · 2607.22236

A PDE approach to the 2D Yang-Mills measure

Ilya Chevyrev·Tom Klose·Abdulwahab Mohamed

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Abstract

We introduce the concept of rough additive functions, which extends rough paths theory to line integrals of distributional 1-forms. In the context of gauge theory, we use this notion to define controlled gauge transformations and holonomies via RDEs. One of our main results is a rough version of Uhlenbeck compactness for distributional connections based on rough additive functions. The main ingredient is a singular elliptic PDE to obtain a Coulomb gauge. We solve this PDE using regularity structures and a method inspired by the implicit function theorem. Surprisingly, the model needed to solve the equation is determined entirely from rough additive functions, which is a simpler and geometrically more natural object. We apply our results to the Yang-Mills measure on the unit square, showing that it has a gauge-fixed representation with optimal regularity. Although we focus on the unit square in this article, we expect our results to apply to more general surfaces.

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Ilya Chevyrev, Tom Klose, Abdulwahab Mohamed. 2026-07-24. A PDE approach to the 2D Yang-Mills measure. https://arxiv.org/abs/2607.22236

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