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- W4313303980 abstract "We embed Feynman integrals in the subvarieties of Grassmannians through homogenization of the integrands in projective space, then obtain GKZ-systems satisfied by those scalar integrals. The Feynman integral can be written as linear combinations of the hypergeometric functions of a fundamental solution system in neighborhoods of regular singularities of the GKZ-system, whose linear combination coefficients are determined by the integral on an ordinary point or some regular singularities. Taking some Feynman diagrams as examples, we elucidate in detail how to obtain the fundamental solution systems of Feynman integrals in neighborhoods of regular singularities. Furthermore we also present the parametric representations of Feynman integrals of the 2-loop self-energy diagrams which are convenient to embed in the subvarieties of Grassmannians." @default.
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- W4313303980 date "2022-12-30" @default.
- W4313303980 modified "2023-10-18" @default.
- W4313303980 title "Feynman integrals of Grassmannians" @default.
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- W4313303980 doi "https://doi.org/10.1103/physrevd.106.116025" @default.
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