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000472022 088__ $$2arXiv$$aarXiv:2111.15501
000472022 088__ $$2Fermilab$$aDO-TH-21-16
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000472022 1001_ $$0P:(DE-H253)PIP1003764$$aBlümlein, Johannes$$b0$$eCorresponding author$$udesy
000472022 245__ $$aHypergeometric Structures in Feynman Integrals
000472022 260__ $$c2021
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000472022 500__ $$a55 pages, several anc. files
000472022 520__ $$aHypergeometric structures in single and multiscale Feynman integrals emerge in a wide class of topologies. Using integration-by-parts relations, associated master or scalar integrals have to be calculated. For this purpose it appears useful to devise an automated method which recognizes the respective (partial) differential equations related to the corresponding higher transcendental functions. We solve these equations through associated recursions of the expansion coefficient of the multivalued formal Taylor series. The expansion coefficients can be determined using either the package {\tt Sigma} in the case of linear difference equations or by applying heuristic methods in the case of partial linear difference equations. In the present context a new type of sums occurs, the Hurwitz harmonic sums, and generalized versions of them. The code {\tt HypSeries} transforming classes of differential equations into analytic series expansions is described. Also partial difference equations having rational solutions and rational function solutions of Pochhammer symbols are considered, for which the code {\tt solvePartialLDE} is designed. Generalized hypergeometric functions, Appell-,~Kampé de Fériet-, Horn-, Lauricella-Saran-, Srivasta-, and Exton--type functions are considered. We illustrate the algorithms by examples.
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000472022 650_7 $$2INSPIRE$$aTaylor expansion
000472022 650_7 $$2INSPIRE$$atopology
000472022 650_7 $$2INSPIRE$$amaster integral
000472022 650_7 $$2INSPIRE$$acomputer: algebra
000472022 650_7 $$2INSPIRE$$anumerical methods
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000472022 7001_ $$0P:(DE-H253)PIP1086086$$aSaragnese, Marco$$b1$$udesy
000472022 7001_ $$0P:(DE-H253)PIP1093315$$aSchneider, Carsten$$b2
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