Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 76: Invited Overview Talks 5

T 76.3: Hauptvortrag

Donnerstag, 7. März 2024, 10:00–10:30, Geb. 30.95: Audimax

High precision gravitational wave physics from quantum field theory — •Jan Plefka — Humboldt-Universität zu Berlin, Berlin, Germany

Predicting the outcome of scattering processes of elementary particles in colliders is the central achievement of relativistic quantum field theory applied to the fundamental (non-gravitational) interactions of nature. While the gravitational interactions are too minuscule to be observed in the microcosm, they dominate the interactions at large scales. As such the inspiral and merger of black holes and neutron stars in our universe are now routinely observed by gravitational wave detectors. The need for high precision theory predictions of the emitted gravitational waveforms has opened a new window for the application of perturbative quantum field theory techniques to the domain of classical gravity. In this talk I will show how observables in the classical scattering of black holes and neutron stars can be efficiently computed in a perturbative expansion using a world-line quantum field theory; thereby combining state-of-the-art Feynman integration technology with perturbative quantum gravity. Here, the black holes or neutron stars are modelled as point particles in an effective field theory sense. Fascinatingly, the intrinsic spin of the black holes may be captured by a supersymmetric extension of the world-line theory, enabling the computation of the far field wave-form including spin and tidal effects to highest precision.

Keywords: Gravitational Waves; Quantum Field Theory; Effective Field Theory; Multi-loop Feynman integrals; Supersymmetry