Environmental Effects in Post-Minkowskian Dynamics: Effective Field Theory, Feynman Rules, and Ward Identities for Compact Objects in Relativistic Fluids
This paper develops a hydrodynamic effective field theory for compact objects moving through inviscid fluids by establishing Feynman rules and generalized Ward identities that link graviton and phonon amplitudes, thereby enabling the incorporation of environmental effects into post-Minkowskian calculations such as the derivation of relativistic dynamical friction.