全多迹树级EYM放大器的扩展
Expansion of All Multitrace Tree Level EYM Amplitudes
摘要：
本文研究了树层多道Einstein-Yang-Mills（EYM）振幅的展开。首先，我们提出了两种类型的递归展开树级EYM振幅与任意数量的胶子，引力子和痕迹的那些振幅较少的痕迹或/和引力子。在此基础上，给出了许多支持证据，包括利用Cachazo-He-Yuan（CHY）公式和Britto-Cachazo-Feng-Witten（BCFW）递归关系的证明。作为副产品，两种类型的广义BCJ关系的多道EYM进一步提出，这将是有用的BCFW证明。在重复应用递归展开之后，任何多道EYM振幅都可以在树级颜色排序Yang-Mills（YM）振幅的Kleiss-Kuijf（KK）基中给出。因此，Bern-Carrasco-Johansson（BCJ）分子，作为展开系数，为所有多道EYM振幅自然构造。
英文摘要：
In this paper, we investigate the expansion of tree level multitrace Einstein-Yang-Mills (EYM) amplitudes. First, we propose two types of recursive expansions of tree level EYM amplitudes with an arbitrary number of gluons, gravitons and traces by those amplitudes with fewer traces or/and gravitons. Then we give many support evidence, including proofs using the Cachazo-He-Yuan (CHY) formula and Britto-Cachazo-Feng-Witten (BCFW) recursive relation. As a byproduct, two types of generalized BCJ relations for multitrace EYM are further proposed, which will be useful in the BCFW proof. After one applies the recursive expansions repeatedly, any multitrace EYM amplitudes can be given in the Kleiss-Kuijf (KK) basis of tree level color ordered Yang-Mills (YM) amplitudes. Thus the Bern-Carrasco-Johansson (BCJ) numerators, as the expansion coefficients, for all multitrace EYM amplitudes are naturally constructed.
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