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arXiv 2005.03638hep-th
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交叉对称BCJ树分子的有效计算

Efficient Calculation of Crossing Symmetric BCJ Tree Numerators

Alex Edison, Fei Teng

摘要:

本文提出了一种直接计算(超)Yang-Mills和Yang-Mills标量理论中双拷贝相容树分子的改进方法。我们的新方案摆脱了对参考序的任何明确依赖,恢复了分子的交叉对称性。这反过来又提高了算法的计算效率,使我们能够远远超出基于参考阶的方法可访问的外部粒子的数量。出于并行研究的一个循环BCJ分子从向前限制,我们探索的推广,包括一对费米子。为了提高新算法的可访问性,我们提供了一个Mathematica软件包,实现了分子构造。计算的结构还提供了一个简单的介绍,最小耦合的大质量粒子可能有用的未来计算在经典和量子引力。

英文摘要:

In this paper, we propose an improved method for directly calculating double-copy-compatible tree numerators in (super-)Yang-Mills and Yang-Mills-scalar theories. Our new scheme gets rid of any explicit dependence on reference orderings, restoring a form of crossing symmetry to the numerators. This in turn improves the computational efficiency of the algorithm, allowing us to go well beyond the number of external particles accessible with the reference order based methods. Motivated by a parallel study of one-loop BCJ numerators from forward limits, we explore the generalization to include a pair of fermions. To improve the accessiblity of the new algorithm, we provide a Mathematica package that implements the numerator construction. The structure of the computation also provides for a straightforward introduction of minimally-coupled massive particles potentially useful for future computations in both classical and quantum gravity.

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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