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Tensor Reduction of Sunset by Generating Function

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arxiv 2509.18730 v2 pith:GDEJPXLB submitted 2025-09-23 hep-th

Tensor Reduction of Sunset by Generating Function

classification hep-th
keywords reductionequationsmethodtensorbeencompletefunctiongenerating
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Recently, the generating function has been proposed as an alternative reduction method. This method has been tested at the one-loop level, including the tensor reduction and propagators with higher powers. In this work, we initiate the study of the method for higher loops by focusing on the sunset diagram, which is the simplest nontrivial two-loop integral. By employing PV reduction equations together with syzygy equations, we construct a complete system of differential equations. Through series expansion, we derive a complete set of recurrence relations, which can efficiently reduce any high-rank tensor structure.

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Cited by 3 Pith papers

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  2. An Algorithm for the Symbolic Reduction of Multi-loop Feynman Integrals via Generating Functions

    hep-ph 2026-05 unverdicted novelty 7.0

    A new generating-function framework turns IBP relations into differential equations in a non-commutative algebra, yielding an iterative algorithm that derives symbolic reduction rules and checks completeness for topol...

  3. Twisted Feynman Integrals: from generating functions to spin-resummed post-Minkowskian dynamics

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    Twisted Feynman integrals are introduced with graded Symanzik polynomials, classified as exponential periods, and shown to have geometry not inferable from generalized Baikov leading singularities.