Abstract:  I will discuss an effective field theory (EFT) of two massive gravitationally interacting bodies in a worldline formalism. While the conservative potential is usually the soughtafter quantity, we instead use the radial action as a central quantity. From this gaugeinvariant object all other desirable observables (and the potential) for the binary inspiral problem can be easily derived. From the EFT perspective, the radial action, as a PostMinkowskian expansion in G, can be obtained from the scattering angle via an analytic continuation in angular momentum and energy. I will demonstrate the derivation of the scattering angle and how the whole network of related quantities for the bound problem is obtained via this simple analytic continuation.
Zoom link:
https://mpiaei.zoom.us/j/6282782272
