Abstract
Bounds for large-mass behaviour in renormalized perturbation expansions at zero temperature, which were previously obtained by Manoukian and Caswell-Kennedy in momentum space, are rederived in the parametric representation. A very simple unified proof of the BPHZ theorem and the decoupling theorem is also given. A new technique for asymptotic analysis, based on a generalized Kontorovich-Lebedev integral transform, is introduced. This method is applied to find the leading high-temperature behaviour of perturbative field theories in the imaginary-time formalism. We prove that diagrams containing nonstatic modes, which at high temperature behave like particles with a large mass, are suppressed relative to purely static diagrams. This rigorously proves a limited form of dimensional reduction at infinite temperature.
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Communicated by K. Gawedzki
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Landsman, N.P. Large-mass and high-temperature behaviour in perturbative quantum field theory. Commun.Math. Phys. 125, 643–660 (1989). https://doi.org/10.1007/BF01228346
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DOI: https://doi.org/10.1007/BF01228346