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arXiv · 2512.03217

Generalized Yang-Mills theory: Interpolating between SDYM and YM

Tolga Domurcukgül·Hao Geng·Mendel Nguyen·Mithat Ünsal
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Abstract

We construct a generalized Yang-Mills (YM) theory with two real couplings, interpolating continuously between the Self-Dual Yang-Mills (SDYM) limit (also called Chalmers-Siegel theory) and physical Yang-Mills theory. The kinetic coupling $\epsilon$ controls local fluctuations and anti-instanton weight, while the topological coupling $g$ controls the instanton weight. Both couplings are asymptotically free. We derive an exact all-order relation between the beta functions of the two couplings, revealing a Renormalization Group invariant, a new dimensionless expansion parameter $\Lambda_\epsilon / \Lambda_g$ into the study of YM theory. In the SDYM limit, the vacuum is populated by a finite density of topological defects, yet local correlators decay algebraically, consistent with a non-unitary conformal field theory. We confirm this mechanism via compactification on arbitrary size $\mathbb{R}^3 \times S^1$, where the vacuum maps to a non-interacting ideal gas of monopole-instantons. As the kinetic coupling is turned on, a mass gap and confinement scale emerge.

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Tolga Domurcukgül, Hao Geng, Mendel Nguyen, Mithat Ünsal. 2025-12-02. Generalized Yang-Mills theory: Interpolating between SDYM and YM. https://arxiv.org/abs/2512.03217

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