Abstract
I provide a new idea based on geometric analysis to obtain a positive mass gap in pure non-abelian renormalizable Yang-Mills theory. The orbit space, that is the space of connections of Yang-Mills theory modulo gauge transformations, is equipped with a Riemannian metric that naturally arises from the kinetic part of reduced classical action and admits a positive definite sectional curvature. The corresponding regularized Bakry-Émery Ricci curvature (if positive) is shown to produce a mass gap for 2+1 and 3+1 dimensional Yang-Mills theory assuming the existence of a quantized Yang-Mills theory on (ℝ1+2, η) and (ℝ1+3, η), respectively. My result on the gap calculation, described at least as a heuristic one, applies to non-abelian Yang-Mills theory with any compact semi-simple Lie group in the aforementioned dimensions. In 2+1 dimensions, the square of the Yang-Mils coupling constant \( {g}_{YM}^2 \) has the dimension of mass, and therefore the spectral gap of the Hamiltonian is essentially proportional to \( {g}_{YM}^2 \) with proportionality constant being purely numerical as expected. Due to the dimensional restriction on 3+1 dimensional Yang-Mills theory, it seems one ought to introduce a length scale to obtain an energy scale. It turns out that a certain ‘trace’ operation on the infinite-dimensional geometry naturally introduces a length scale that has to be fixed by measuring the energy of the lowest glu-ball state. However, this remains to be understood in a rigorous way.
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Acknowledgments
P.M. thanks Prof. Vincent Moncrief, Prof. Shing-Tung Yau, Prof. Cliff Taubes for numerous useful discussions related to this project such as moduli spaces of Yang-Mills connections, geometric quantum field theory, metric measure spaces, etc. Special thanks to Prof. V.P Nair for pointing out several vital issues that needed to be ironed out and suggesting potential solutions. P.M. thanks Daniel Kapec for many physical insights and the referee for a very thorough review that improved the manuscript substantially. This work was supported by the Center of Mathematical Sciences and Applications (CMSA), Department of Mathematics at Harvard University.
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Mondal, P. A geometric approach to the Yang-Mills mass gap. J. High Energ. Phys. 2023, 191 (2023). https://doi.org/10.1007/JHEP12(2023)191
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DOI: https://doi.org/10.1007/JHEP12(2023)191