arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1606.00670hep-th
收藏

CHY-被积函数的交比恒等式与高阶极点

Cross-ratio Identities and Higher-order Poles of CHY-integrand

Carlos Cardona, Bo Feng, Humberto Gomez, Rijun Huang

摘要:

一般Cachazo-He-Yuan(CHY)-被积函数的计算是一个很大的挑战,需要有效的计算方法来进行实际计算。本文提出了一种利用交比恒等式的系统分解算法,它为计算任何CHY-被积函数提供了一种解析的、易于实现的方法。该算法的目标是在有限步内将一个含有高阶极点的CHY-被积函数分解为一个只有简单极点的CHY-被积函数的线性组合,并最终由简单极点的积分规则来计算.为了使该方法更有效地为CH-被积与大量的粒子和复杂的高阶极点结构,我们结合了$Λ$ -算法和交比身份,并作为一个副产品,它为我们提供了一种方法来处理CH-被积的$Λ$ -算法是不适用于其原始配方。

英文摘要:

The evaluation of generic Cachazo-He-Yuan(CHY)-integrands is a big challenge and efficient computational methods are in demand for practical evaluation. In this paper, we propose a systematic decomposition algorithm by using cross-ratio identities, which provides an analytic and easy to implement method for the evaluation of any CHY-integrand. This algorithm aims to decompose a given CHY-integrand containing higher-order poles as a linear combination of CHY-integrands with only simple poles in a finite number of steps, which ultimately can be trivially evaluated by integration rules of simple poles. To make the method even more efficient for CHY-integrands with large number of particles and complicated higher-order pole structures, we combine the $Λ$-algorithm and the cross-ratio identities, and as a by-product it provides us a way to deal with CHY-integrands where the $Λ$-algorithm was not applicable in its original formulation.

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。

↑