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arXiv 2201.12072hep-th
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前向极限下Einstein-Yang-Mills的单圈振幅

One-loop amplitudes in Einstein-Yang-Mills from forward limits

Franziska Porkert, Oliver Schlotterer

摘要:

本文提出了一种计算任意数量的外规范多重态和引力多重态的单圈Einstein-Yang-Mills振幅的被积函数的方法。我们的构造依赖于Einstein-Yang-Mills的双拷贝结构作为(超级)Yang-Mills,并采用所谓的YM+ $ϕ^3$理论--纯Yang-Mills耦合到双伴随标量--我们通过单循环Cachazo-He-Yuan公式实现。YM+ $ϕ^3$构建块是由外部胶子和标量的树级输入的前向极限得到的,我们给出了耦合$g$和$κ$中任意数量迹和阶的合成规则.一方面,我们阐明了超对称和维数不可知的关系,将爱因斯坦-杨-米尔斯的圈被积简化为纯规范理论的圈被积。另一方面,我们提出了四点结果的最大和半最大的超对称性,所有的超对称取消曝光。在半极大的情况下,我们确定六维异常由于手征超多重态的循环。

英文摘要:

We present a method to compute the integrands of one-loop Einstein-Yang-Mills amplitudes for any number of external gauge and gravity multiplets. Our construction relies on the double-copy structure of Einstein-Yang-Mills as (super-)Yang-Mills with the so-called YM+$ϕ^3$ theory -- pure Yang-Mills coupled to bi-adjoint scalars -- which we implement via one-loop Cachazo-He-Yuan formulae. The YM+$ϕ^3$ building blocks are obtained from forward limits of tree-level input in external gluons and scalars, and we give the composition rules for any number of traces and orders in the couplings $g$ and $κ$. On the one hand, we spell out supersymmetry- and dimension-agnostic relations that reduce loop integrands of Einstein-Yang-Mills to those of pure gauge theories. On the other hand, we present four-point results for maximal and half-maximal supersymmetry where all supersymmetry cancellations are exposed. In the half-maximal case, we determine six-dimensional anomalies due to chiral hypermultiplets in the loop.

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