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arXiv 1706.01889hep-thmath.NT
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四面体模图函数

Tetrahedral modular graph functions

Axel Kleinschmidt, Valentin Verschinin

摘要:

第二类弦论中单圈振幅的低能展开产生了一系列世界片积分,其被积函数可以用世界片费曼图表示。这些被积函数是模不变的,理解模拉普拉斯算子对它们的作用结构对于确定它们对弦散射振幅的贡献是很重要的。在本文中,我们研究了一个特殊的无限家庭,这样的被积与三圈标量真空图的四面体拓扑,并找到封闭形式的拉普拉斯算子的作用。我们分析了可能的特征值和退化的拉普拉斯算子组和代表性理论的手段。

英文摘要:

The low-energy expansion of one-loop amplitudes in type II string theory generates a series of world-sheet integrals whose integrands can be represented by world-sheet Feynman diagrams. These integrands are modular invariant and understanding the structure of the action of the modular Laplacian on them is important for determining their contribution to string scattering amplitudes. In this paper we study a particular infinite family of such integrands associated with three-loop scalar vacuum diagrams of tetrahedral topology and find closed forms for the action of the Laplacian. We analyse the possible eigenvalues and degeneracies of the Laplace operator by group- and representation-theoretic means.

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