The general relativistic two-body dynamics is a subject of great theoretical and practical interest in light of the ongoing observations of gravitational waves by the LIGO/Virgo observatories. In recent years the classical limit of quantum scattering amplitudes provided a means to establish the frontier in the weak-field relativistic approach to this problem. In this talk we review an effective fi eld theory approach to the gravitational interactions of and an amplitudes-based framework for the construction of the two-body Hamiltonian for spinning binary systems. We present evidence for a conjectured definition of Kerr black holes
from a quantum field theory perspective and discuss a possible all-order direct relation between the open-orbit observables of spinning binaries and the eikonal phase of the four-particle scattering amplitude.
Host: Bianka Meçaj, Petar Tadic, & Yuan Xin