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arXiv 2109.07584hep-th
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Feynman积分和主A-行列式的运动学奇异性

Kinematic singularities of Feynman integrals and principal A-determinants

René Pascal Klausen

摘要:

本文从Gelfand,Kapranov和Zelevinsky(GKZ)提出的广义A-判别式和A-超几何函数的角度研究了Feynman积分的解析性质.这使我们能够通过主A-行列式给出奇异轨迹(也称为朗道簇)的清晰和数学上的严格描述。我们还包括各种第二类奇点的描述。此外,通过Horn-Kapranov参数化,我们给出了一个非常有效的方法来计算参数化的Landau簇。此外,我们提出了一种新的方法来研究多值费曼积分的片结构的coamoebas使用。

英文摘要:

We consider the analytic properties of Feynman integrals from the perspective of general A-discriminants and A-hypergeometric functions introduced by Gelfand,Kapranov and Zelevinsky (GKZ). This enables us, to give a clear and mathematically rigour description of the singular locus, also known as Landau variety, via principal A-determinants. We also comprise a description of the various second type singularities. Moreover, by the Horn-Kapranov-parametrization we give a very efficient way to calculate a parametrization of Landau varieties. We furthermore present a new approach to study the sheet structure of multivalued Feynman integrals by use of coamoebas.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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