arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.05329hep-th
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圈幅值单值关系和色-运动学对偶性

Loop amplitudes monodromy relations and color-kinematics duality

Eduardo Casali, Sebastian Mizera, Piotr Tourkine

摘要:

色-运动学对偶性是规范理论的一个显著特征,它与双拷贝一起,是散射振幅的大量新发展的核心。到目前为止,它的有效性已被证实在大多数情况下,只有经验,缺乏超越树级的第一原理的理解。本文通过对弦论单值关系的场论极限在一个圈上的详细分析,提供了第一性原理理解色运动学对偶性和圈级双拷贝的初步步骤。在这个极限下,我们剖析了生成的费曼图的类型以及它们所服从的关系。我们发现,与接触项的图形是不可避免的,并产生在场论限制的“散装”的轮廓,没有一个标准的物理解释弦微扰理论。我们展示了它们是如何与环路动量定义中的模糊性相关的,它们的作用正是为了消除这些模糊性。

英文摘要:

Color-kinematics duality is a remarkable conjectured property of gauge theory which, together with double copy, is at the heart of a wealth of new developments in scattering amplitudes. So far, its validity has been verified in most cases only empirically, lacking a first-principle understanding beyond tree-level. In this paper we provide initial steps in a first-principle understanding of color-kinematics duality and double-copy at loop level, through a detailed analysis of the field-theory limit of the monodromy relations of string theory at one loop. In this limit, we dissect the type of Feynman graphs generated and the relations they obey. We find that graphs with contact-terms are unavoidable and are generated in the field theory limit of "bulk" contours which do not have a standard physical interpretation in string perturbation theory. We show how they are related to ambiguities in the definition of the loop momentum and that their role is precisely to cancel those ambiguities.

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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