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Vector Space of Feynman Integrals and Multivariate Intersection Numbers

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arxiv 1907.02000 v1 pith:255AZM6J submitted 2019-07-03 hep-th hep-ph

classification hep-thhep-ph
keywords integralsfeynmanintersectionnumbersfirstintegralmultivariaterelations
verification ladder T0 review T1 audit T2 compute T3 formal
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Feynman integrals obey linear relations governed by intersection numbers, which act as scalar products between vector spaces. We present a general algorithm for constructing multivariate intersection numbers relevant to Feynman integrals, and show for the first time how they can be used to solve the problem of integral reduction to a basis of master integrals by projections, and to directly derive functional equations fulfilled by the latter. We apply it to the derivation of contiguity relations for special functions admitting multi-fold integral representations, and to the decomposition of a few Feynman integrals at one- and two-loops, as first steps towards potential applications to generic multi-loop integrals.

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Cited by 5 Pith papers

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  5. Refining Integration-by-Parts Reduction of Feynman Integrals with Machine Learning

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    Machine learning program search rediscovers state-of-the-art integration-by-parts seeding heuristics and finds a modestly smaller seed set for a single two-loop benchmark integral.

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