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arXiv 1709.08503hep-th
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多维剩余微分算子的BCJ分子

BCJ Numerators from Differential Operator of Multidimensional Residue

Gang Chen, Tianheng Wang

摘要:

在以前的工作中,我们设计了一个微分算子来计算出现在Cachazo-He-Yuan(CHY)形式中的典型积分,本文进一步简化了这种方法。我们观察到,在树的水平上,控制微分算子的自由参数的数量仅取决于外部线路的数量,解决散射方程所产生的约束后。这使我们能够构造一个约简矩阵,它将高阶微分算子的参数与低阶微分算子的参数联系起来。约简矩阵是理论无关的,可以通过求解一组显式给定的线性条件来获得。这种简化矩阵的重复应用最终将给定的树级CHY-样积分转化为准备好的形式。我们还提供了解析表达式的参数与任何这样的准备形式在树级。最后给出了任意类CHY积分的多维留数用约化矩阵表示的紧表达式。本文采用对偶基投影法,在树的层次上得到了非局部Bern-Carrasco-Johansson(BCJ)分子的类CHY表示。这些BCJ分子的有效计算的改进方法,涉及约简矩阵。

英文摘要:

In previous works, we devised a differential operator for evaluating typical integrals appearing in the Cachazo-He-Yuan (CHY) forms and in this paper we further streamline this method. We observe that at tree level, the number of free parameters controlling the differential operator depends solely on the number of external lines, after solving the constraints arising from the scattering equations. This allows us to construct a reduction matrix that relates the parameters of a higher-order differential operator to those of a lower-order one. The reduction matrix is theory-independent and can be obtained by solving a set of explicitly given linear conditions. The repeated application of such reduction matrices eventually transforms a given tree-level CHY-like integral to a prepared form. We also provide analytic expressions for the parameters associated with any such prepared form at tree level. We finally give a compact expression for the multidimensional residue for any CHY-like integral in terms of the reduction matrices. We adopt a dual basis projector which leads to the CHY-like representation for the non-local Bern-Carrasco-Johansson (BCJ) numerators at tree level in Yang-Mills theory. These BCJ numerators are efficiently computed by the improved method involving the reduction matrix.

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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