The synergy between amplitude based and general relativity based perturbation methods has led to many interesting new insights on gravitational two-body systems. I will present the recent computation of the scattering waveform at O(G2) and all order in the relative velocity, using the amplitude based KMOC formalism. To achieve the correct result, one needs to carefully take into account several subtle contributions: (1) the iterative part of the KMOC matrix elements, which is intimately correlated with a frame choice; (2) the scheme dependent epsilon/epsilon contribution from the dimensional regularization of the IR divergence; (3) both the external and internal zero-energy gravitons whose contribution turns out to be a BMS transformation. We find exact agreement up to 2.5PN with the waveform computed from the general relativity based MPM method.

报告人简介

滕飞，2017年毕业于美国犹他大学，随后在瑞典乌普萨拉大学和美国宾州州立大学从事博士后工作。研究方向包括场论和弦论的散射振幅，以及使用振幅方法探索经典引力系统的相互作用等。

邀请人

何颂 研究员