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Snowmass White Paper: Gravitational Waves and Scattering Amplitudes

: We review recent progress and future prospects for harnessing powerful tools from theoretical high-energy physics, such as scattering amplitudes and eﬀective ﬁeld theory, to develop a precise and systematically improvable framework for calculating gravitational-wave signals from binary systems composed of black holes and/or neutron stars. This eﬀort aims to provide state-of-the-art predictions that will enable high-precision measurements at future gravitational-wave detectors. In turn, applying the tools of quantum ﬁeld theory in this new arena will uncover theoretical structures that can transform our understanding of basic phenomena and lead to new tools that will further the cycle of innovation. While still in a nascent stage, this research direction has already derived new analytic results in general relativity, and promises to advance the development of highly accurate waveform models for ever more sensitive detectors.