Speaker: Dimitrios Kosmopoulos (University of Patras)

Title: Gravitational Waves from Amplitudes in Curved Space

Abstract: Recent years have seen great progress in applying the Amplitudes toolkit to the binary inspiral problem relevant for present and future gravitational-wave observatories. In this talk, I will present a novel approach for calculations in this context which uses the methods of perturbative Quantum Field Theory around flat space while at the same time leverages the all-orders-in-G information carried by black-hole solutions to the Einstein equations. This framework computes scattering amplitudes in the curved-space setup where a light particle of mass m is treated as a probe in the geometry sourced by a heavy particle of mass M. Observables are organized in the gravitational self-force expansion, i.e. as an expansion in m/M. Backreaction of the background is captured via Goldstone bosons associated with the spontaneous breaking of spacetime symmetries. I will discuss advantages introduced by this formalism and cross checks against the literature.

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