Speaker: Lara Bohnenblust

Title: Gravitational Waveforms for Scattering Binaries

Abstract: Future missions to detect gravitational waves will operate at higher sensitivity and cover a wide range of frequencies. This advancements will enable the detection of new types of systems, such as hyperbolic encounters and high-spin sources, requiring new theoretical predictions of gravitational waveforms. One suitable method for these predictions is the post-Minkowskian expansion. In my talk, I will present the recent calculation of the next-to-leading order post-Minkowskian waveform, including linear-in-spin corrections. The result is obtained from five point one-loop scattering amplitudes involving massive scalars, vectors, and a graviton and computations are performed in the numerical unitarity framework. Special emphasize is put on the treatment of the “cut term” in the observable-based approach of Kosower, Maybee and O’Connell. The result includes infrared (IR) and ultraviolet (UV) divergences and I will explain their origin and their treatment to obtain a finite observable.

This talk will be in hybrid mode via zoom, please contact the seminar organisers to obtain the password.

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