The hidden simplicity of the classical limit

Abstract
I will illustrate the hidden simplicity relating the classical limits of different theories, including N=8 supergravity, electrodynamics, and certain scalar theories. Despite this simplicity, extracting observables from the classical limit becomes rapidly computationally expensive at higher orders. This motivates a complementary approach to weak-field gravity, based on the Schwinger–Keldysh path integral, in which the dynamics and waveform are computed for generic relativistic worldlines, bypassing several technical intermediate steps in the computation of gravitational-wave observables.

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