# Expansion of Einstein-Yang-Mills theory by Differential Operators

## TL;DR

This paper introduces a new differential operator-based method to efficiently compute expansion coefficients relating Einstein-Yang-Mills and other amplitudes within the CHY formalism, simplifying the understanding of their interconnections.

## Contribution

It presents a novel strategy utilizing differential operators to determine expansion coefficients between different amplitudes in the CHY formalism.

## Key findings

- Effective calculation of expansion coefficients achieved
- Simplifies the relation between Einstein-Yang-Mills and other theories
- Enhances understanding of amplitude relations in CHY formalism

## Abstract

The factorization form of the integrands in the Cachazo-He-Yuan (CHY) formalism makes the generalized Kawai-Lewellen-Tye (KLT) relations manifest, thus amplitudes of one theory can be expanded in terms of the amplitudes of another theory. Although this claim seems a rather natural consequence of the above structure, finding the exact expansion coefficients to express an amplitude in terms of another amplitudes is, nonetheless, a nontrivial task despite many efforts devoted to it in the literature. In this paper, we propose a new strategy based in using the differential operators introduced by Cheung, Shen and Wen, and taking advantage of the fact these operators already relate the amplitudes of different theories. Using this new method, expansion coefficients can be found effectively.

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Source: https://tomesphere.com/paper/1904.05997