Gravitational Bremsstrahlung with Tidal Effects in the Post-Minkowskian Expansion

We compute the mass and current quadrupole tidal corrections to the four-momentum and energy flux radiated during the scattering of two spinless bodies, at leading order in $G$ and at all orders in the velocities, using the effective field theory worldline approach. In particular, we derive the conserved stress-energy tensor linearly coupled to gravity generated by the two bodies, including tidal fields, and the waveform in direct space. The integral is solved using scattering amplitude techniques. We show that our expressions are consistent with existing results up to the next-to-next-to-leading order in the post-Newtonian expansion.

Figure 1

The Feynman diagrams needed for the computation of the stress-energy tensor: (a) and (b) are the point-particle contributions, and (c) is the tidal one. The symmetric terms are obtained by exchange of $1\leftrightarrow 2$.