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arXiv 2106.01280hep-th
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一圈之外的图解相互作用

The diagrammatic coaction beyond one loop

Samuel Abreu, Ruth Britto, Claude Duhr, Einan Gardi, James Matthew

摘要:

图解作用映射任何给定的费曼图到成对的图和割图,这样,从理论上讲,当这些图被替换为相应的费曼积分时,人们获得了相应函数上的作用。函数的共同作用是通过配对的基础上的微分形式,对应于主积分,与基础上的集成轮廓,对应于独立的切割积分。在一个循环中,一个一般的图形相互作用,建立了使用尺寸正则化,这可能是实现在一个全球的超几何函数的相互作用,或等价地,通过多个多边形上的局部相互作用的顺序顺序在$ε$扩展。本文件采取的第一步,在概括的图形相互作用超出一个循环。我们首先建立控制任何循环顺序下的图形相互作用的一般属性。然后,我们专注于双环拓扑的例子,所有的积分扩展到多面体。在每一种情况下,我们确定基地的主积分和削减的超几何函数,然后使用的整体余作用,建立图解余作用的所有主积分的拓扑结构。图解作用编码费曼积分的完整不连续集,以及它们满足的微分方程,提供了一个通用工具来理解它们的物理和数学性质。

英文摘要:

The diagrammatic coaction maps any given Feynman graph into pairs of graphs and cut graphs such that, conjecturally, when these graphs are replaced by the corresponding Feynman integrals one obtains a coaction on the respective functions. The coaction on the functions is constructed by pairing a basis of differential forms, corresponding to master integrals, with a basis of integration contours, corresponding to independent cut integrals. At one loop, a general diagrammatic coaction was established using dimensional regularisation, which may be realised in terms of a global coaction on hypergeometric functions, or equivalently, order by order in the $ε$ expansion, via a local coaction on multiple polylogarithms. The present paper takes the first steps in generalising the diagrammatic coaction beyond one loop. We first establish general properties that govern the diagrammatic coaction at any loop order. We then focus on examples of two-loop topologies for which all integrals expand into polylogarithms. In each case we determine bases of master integrals and cuts in terms of hypergeometric functions, and then use the global coaction to establish the diagrammatic coaction of all master integrals in the topology. The diagrammatic coaction encodes the complete set of discontinuities of Feynman integrals, as well as the differential equations they satisfy, providing a general tool to understand their physical and mathematical properties.

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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