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arXiv 1901.02887hep-th
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显式对偶共形回路积分

Manifestly Dual-Conformal Loop Integration

Jacob L. Bourjaily, Falko Dulat, Erik Panzer

摘要:

局部的,明显的双重共形不变的循环被积现在已知的所有有限量与观察在平面,最大超对称杨-米尔斯理论通过三个循环。然而,这些表示不是红外有限项,因此需要正则化;即使使用与双共形不变性一致的调节器,普通的环路积分方法也会天真地掩盖这种对称性。在这项工作中,我们将展示如何通过至少两个回路的任何平面回路积分可以直接在严格有限的,明显的双共形费曼参数积分方面进行系统调节和评估。我们应用这些方法的情况下,两个循环的比率和剩余功能为6个粒子,再现已知的结果,在个别监管的局部循环积分,我们评论的一些新奇的,出现这种正规化计划以前没有看到在一个循环。

英文摘要:

Local, manifestly dual-conformally invariant loop integrands are now known for all finite quantities associated with observables in planar, maximally supersymmetric Yang-Mills theory through three loops. These representations, however, are not infrared-finite term by term and therefore require regularization; and even using a regulator consistent with dual-conformal invariance, ordinary methods of loop integration would naively obscure this symmetry. In this work, we show how any planar loop integral through at least two loops can be systematically regulated and evaluated directly in terms of strictly finite, manifestly dual-conformal Feynman-parameter integrals. We apply these methods to the case of the two-loop ratio and remainder functions for six particles, reproducing the known results in terms of individually regulated local loop integrals, and we comment on some of the novelties that arise for this regularization scheme not previously seen at one loop.

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