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- W3100133069 abstract "Truncated Dyson-Schwinger equations represent finite subsets of the equations of motion for Green's functions. Solutions to these non-linear integral equations can account for non-perturbative correlations. We describe the solution to the Dyson-Schwinger equation for the gluon propagator of Landau gauge QCD in the Mandelstam approximation. This involves a combination of numerical and analytic methods: An asymptotic infrared expansion of the solution is calculated recursively. In the ultraviolet, the problem reduces to an analytically solvable differential equation. The iterative solution is then obtained numerically by matching it to the analytic results at appropriate points. Matching point independence is obtained for sufficiently wide ranges. The solution is used to extract a non-perturbative beta-function. The scaling behavior is in good agreement with perturbative QCD. No further fixed point for positive values of the coupling is found which thus increases without bound in the infrared. The non-perurbative result implies an infrared singular quark interaction relating the scale Lambda of the subtraction scheme to the string tension sigma." @default.
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- W3100133069 date "1998-08-01" @default.
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- W3100133069 title "Solving the gluon Dyson—Schwinger equation in the Mandelstam approximation" @default.
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- W3100133069 doi "https://doi.org/10.1016/s0010-4655(98)00046-0" @default.
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