Events

Black-hole tides and the renormalization group

Abstract: Tidal Love numbers quantify the finite-size properties of Black Holes and Neutron Stars, such as absorption, dissipation and their response to external fields. Perhaps surprisingly, even in classical general relativity, they undergo renormalization group running due to nonlinearities. In this talk I will explain some exact results about their running, which can be extracted using scattering amplitudes in black-hole perturbation theory and point-particle effective theories (EFT). Due to the universality of the EFT, these results also have applications to the physics of neutron stars, binaries and their signals in gravitational wave observatories. The framework I will present also provides a way to calculate the precise values of both static and dynamical Love numbers of black holes in various dimensions, avoiding ambiguities in other methods.

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Monday, March 3, 2025 11:00 AM