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- W1992436176 abstract "For massless models of quantum field theory, some general theorems are proved concerning the analytic continuation of the renormalization group functions as well as the effective coupling and the propagators. Starting points are analytic properties of the effective coupling and the propagators in the momentum variablek 2, which can be converted into analyticity of β- and γ-functions in the coupling parameter λ. It is shown that the β-function can have branch point singularities related to stationary points of the effective coupling as a function ofk 2. The type of these singularities of β(λ) can be determined explicitly. Examples of possible physical interest are extremal values of the effective coupling at space-like points in the momentum variable, as well as complex conjugate stationary points close to the realk 2-axis. The latter may be related to the sudden transition between weak and strong coupling regimes in quantum chromodynamics. Finally, for the effective coupling and for the propagators, the analytic continuation in both variablesk 2 and λ is discussed." @default.
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- W1992436176 date "1982-09-01" @default.
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- W1992436176 title "Analyticity of effective coupling and propagators in massless models of quantum field theory" @default.
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- W1992436176 doi "https://doi.org/10.1007/bf01208720" @default.
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