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arXiv 1608.01665hep-th
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弦和规范理论中的高回线振幅单值关系

Higher-loop amplitude monodromy relations in string and gauge theory

Piotr Tourkine, Pierre Vanhove

摘要:

弦论中的单值关系提供了一个强大而优雅的形式体系来理解树级场论振幅的一些最深层次的性质,如色运动学对偶性。这种对偶性在量子场论中的环振幅计算方面取得了巨大的进展,但缺乏对单值结构的更高环概括。在这封信中,我们将单值关系推广到开弦论中更高的回路。我们的建设,开放弦图内的轮廓变形参数的基础上,导致新的身份,涉及平面和非平面拓扑结构的弦论。我们写一个和两个循环monodromy公式明确在任何重。在场论极限下,在单圈上我们得到了再现已知结果的恒等式。在两个循环中,我们在四点N=4的超杨-米尔斯振幅的情况下用幺正性检验了我们的公式。

英文摘要:

The monodromy relations in string theory provide a powerful and elegant formalism to understand some of the deepest properties of tree-level field theory amplitudes, like the color-kinematics duality. This duality has been instrumental in tremendous progress on the computations of loop amplitudes in quantum field theory, but a higher-loop generalisation of the monodromy construction was lacking. In this letter, we extend the monodromy relations to higher loops in open string theory. Our construction, based on a contour deformation argument inside open string diagrams, leads to new identities that relate planar and non-planar topologies in string theory. We write one and two-loop monodromy formulae explicitly at any multiplicity. In the field theory limit, at one-loop we obtain identities that reproduce known results. At two loops, we check our formulae by unitarity in the case of the four-point N=4 super-Yang-Mills amplitude.

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