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• W2201260615 abstract "Integration By Parts (IBP) is an important method for computing Feynman integrals. This work describes a formulation of the theory involving a set of differential equations in parameter space, and especially the definition and study of an associated Lie group G. The group acts on parameter space and foliates it into G-orbits. The differential equations essentially provide the gradient of the integral within the orbit in terms of integrals associated with degenerate diagrams. In this way the computation of a Feynman integral at a general point in parameter space is reduced to the evaluation of the Feynman integral at some freely chosen base point on the same orbit, together with a line integral inside the G-orbit and the degenerate integrals along the path. This paper restricts to vacuum diagrams and integrals without numerators, but the method is expected to generalize. The method is demonstrated by application to the two-loop vacuum diagram. A relation between the reducibility of a diagram though IBP and the reducibility of the associated electric circuit though the Y-Delta transform is speculated." @default.
• W2201260615 created "2016-06-24" @default.
• W2201260615 creator A5000012744 @default.
• W2201260615 date "2015-07-06" @default.
• W2201260615 modified "2023-09-27" @default.
• W2201260615 title "Symmetries of Feynman integrals and the Integration By Parts method" @default.
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