Gravitational Waveforms from Scattering Amplitudes


Fei Teng


Apr 1, 2024




Room 815 (NTU Physics)


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.


Fei Teng is currently a postdoc at Penn State University. He did his PhD at the University of Utah and was then a postdoc at Uppsala University in Sweden, before moving to Penn State. He is an expert in the application of scattering amplitude methods to gravitational-wave physics.

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