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arXiv 1010.3679hep-thhep-ph
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在壳环积分的新微分方程

New differential equations for on-shell loop integrals

James M. Drummond, Johannes M. Henn, Jaroslav Trnka

摘要:

我们提出了一种新的类型的微分方程在壳环积分。这些方程是二阶的,重要的是,它们将循环级别减少了一级,因此可以按循环顺序迭代求解。我们提出了几个无穷级数的积分满足这样的迭代微分方程。我们使用的微分算子最好用动量扭量空间来写。使用后者主张在最近的论文讨论循环积分在N=4超级杨米尔斯。我们的动机之一是提供一种工具来推导该理论中散射振幅的分析结果。我们表明,平面MHV振幅高达两个循环所需的积分可以被认为是来自一个单一的主拓扑结构。主积分满足我们的微分方程,大部分约化积分也是如此。微分方程的一个结果是,我们讨论的积分不是任意复杂的超越函数。对于两个特殊的双环积分,我们给出了完整的解析解。平面N=4超杨-米尔斯的散射振幅中出现的积分的简单性强烈地暗示了与理论的基本可积性的关系。我们希望这些微分方程是相关的所有平面MHV和非MHV振幅。我们还讨论了我们的方法可能的扩展到更一般的积分类。

英文摘要:

We present a novel type of differential equations for on-shell loop integrals. The equations are second-order and importantly, they reduce the loop level by one, so that they can be solved iteratively in the loop order. We present several infinite series of integrals satisfying such iterative differential equations. The differential operators we use are best written using momentum twistor space. The use of the latter was advocated in recent papers discussing loop integrals in N=4 super Yang-Mills. One of our motivations is to provide a tool for deriving analytical results for scattering amplitudes in this theory. We show that the integrals needed for planar MHV amplitudes up to two loops can be thought of as deriving from a single master topology. The master integral satisfies our differential equations, and so do most of the reduced integrals. A consequence of the differential equations is that the integrals we discuss are not arbitrarily complicated transcendental functions. For two specific two-loop integrals we give the full analytic solution. The simplicity of the integrals appearing in the scattering amplitudes in planar N=4 super Yang-Mills is strongly suggestive of a relation to the conjectured underlying integrability of the theory. We expect these differential equations to be relevant for all planar MHV and non-MHV amplitudes. We also discuss possible extensions of our method to more general classes of integrals.

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