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- W3000510284 abstract "Green functions in a quantum field theory can be expanded as bivariate series in the coupling and a scale parameter. The leading logs are given by the main diagonal of this expansion, i.e. the subseries where the coupling and the scale parameter appear to the same power; then the next-to leading logs are listed by the next diagonal of the expansion, where the power of the coupling is incremented by one, and so on. We give a general method for deriving explicit formulas and asymptotic estimates for any next-to$^k$ leading-log expansion for a large class of single scale Green functions. These Green functions are solutions to Dyson-Schwinger equations that are known by previous work to be expressible in terms of chord diagrams. We look in detail at the Green function for the fermion propagator in massless Yukawa theory as one example, and the Green function of the photon propagator in quantum electrodynamics as a second example, as well as giving general theorems. Our methods are combinatorial, but the consequences are physical, giving information on which terms dominate and on the dichotomy between gauge theories and other quantum field theories." @default.
- W3000510284 created "2020-01-23" @default.
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- W3000510284 date "2020-02-10" @default.
- W3000510284 modified "2023-10-17" @default.
- W3000510284 title "$$hbox {Next-to}{}^k$$ Leading Log Expansions by Chord Diagrams" @default.
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- W3000510284 doi "https://doi.org/10.1007/s00220-020-03691-7" @default.
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