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Renormalization of the Higgs model: Minimizers, propagators and the stability of mean field theory

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We study the effective actionsS (k) obtained byk iterations of a renormalization transformation of the U(1) Higgs model ind=2 or 3 spacetime dimensions. We identify a quadratic approximationS (k) Q toS (k) which we call mean field theory, and which will serve as the starting point for a convergent expansion of the Green's functions, uniformly in the lattice spacing. Here we show how the approximationsS (k) Q arise and how to handle gauge fixing, necessary for the analysis of the continuum limit. We also establish stability bounds onS (k) Q , uniformly ink. This is an essential step toward proving the existence of a gap in the mass spectrum and exponential decay of gauge invariant correlations.

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Communicated by A. Jaffe

Dedicated to the memory of Kurt Symanzik

Supported in part by the National Science Foundation under Grant PHY 82-03669

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Bałaban, T., Imbrie, J. & Jaffe, A. Renormalization of the Higgs model: Minimizers, propagators and the stability of mean field theory. Commun.Math. Phys. 97, 299–329 (1985). https://doi.org/10.1007/BF01206191

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