Analytic expressions of amplitudes by the cross-ratio identity method

作者：Zhou, Kang^*

来源：European Physical Journal C, 2017, 77(6): 388.

DOI：10.1140/epjc/s10052-017-4941-3

In order to obtain the analytic expression of an amplitude from a generic CHY-integrand, a new algorithm based on the so-called cross-ratio identities has been proposed recently. In this paper, we apply this new approach to a variety of theories including the non-linear sigma model, special Galileon theory, pure Yang-Mills theory, pure gravity, Born-Infeld theory, Dirac-Born-Infeld theory and its extension, Yang-Mills-scalar theory, and Einstein-Maxwell and Einstein-Yang-Mills theory. CHY-integrands of these theories which contain higher-order poles can be calculated conveniently by using the cross-ratio identity method, and all results above have been verified numerically.

• 出版日期2017-6-12
• 单位浙江大学