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On the computation of intersection numbers for twisted cocycles

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arxiv 2002.01930 v2 pith:TDMDXM57 submitted 2020-02-04 math-ph hep-phhep-thmath.AGmath.MP

On the computation of intersection numbers for twisted cocycles

classification math-ph hep-phhep-thmath.AGmath.MP
keywords cocyclesintersectionnumberstwistedalgebraiccomputationextensionsalgorithm
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Intersection numbers of twisted cocycles arise in mathematics in the field of algebraic geometry. Quite recently, they appeared in physics: Intersection numbers of twisted cocycles define a scalar product on the vector space of Feynman integrals. With this application, the practical and efficient computation of intersection numbers of twisted cocycles becomes a topic of interest. An existing algorithm for the computation of intersection numbers of twisted cocycles requires in intermediate steps the introduction of algebraic extensions (for example square roots), although the final result may be expressed without algebraic extensions. In this article I present an improvement of this algorithm, which avoids algebraic extensions.

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