arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.05182hep-thhep-ph
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超弦振幅的双圈Yang-Mills图

Two-loop Yang-Mills diagrams from superstring amplitudes

Lorenzo Magnea, Sam Playle, Rodolfo Russo, Stefano Sciuto

摘要:

从描述具有恒定世界体积场强度的D膜之间相互作用的超弦振幅出发,详细分析了开弦退化极限如何再现相应的场论费曼图.弦结构中的一个关键成分是扭曲(Prym)超微分,因为它们的周期编码了背景场的信息。我们提供了一个有效的方法来计算微扰的行列式的扭曲周期矩阵的超模适当的退化限制。利用这一结果,我们证明了超弦振幅中不同因子的简并与描述双圈水平规范理论有效作用量的单粒子不可约费曼图之间存在着精确的一一对应关系。

英文摘要:

Starting from the superstring amplitude describing interactions among D-branes with a constant world-volume field strength, we present a detailed analysis of how the open string degeneration limits reproduce the corresponding field theory Feynman diagrams. A key ingredient in the string construction is represented by the twisted (Prym) super differentials, as their periods encode the information about the background field. We provide an efficient method to calculate perturbatively the determinant of the twisted period matrix in terms of sets of super-moduli appropriate to the degeneration limits. Using this result we show that there is a precise one-to-one correspondence between the degeneration of different factors in the superstring amplitudes and one-particle irreducible Feynman diagrams capturing the gauge theory effective action at the two-loop level.

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