A tale of tails through generalized unitarity

We introduce a novel framework to study high-order gravitational effects on binary from the scattering of its emitted radiation. Here we focus radiation-reaction due background binary's potential, namely so-called tail effects, as starting point this type effects. start effective field theory composite-particle. Through multi-loop and generalized-unitarity methods, derive causal actions dynamical multipoles, energy spectra, observable flux, these proceed through third subleading such effect, at four-loop level seventh order in post-Newtonian gravity, shedding new light higher-order pushing state art.