Gravitational scattering of two black holes at the fourth post-Newtonian approximation
Gravitational scattering of two black holes at the fourth post-Newtonian approximation
We compute the (center-of-mass frame) scattering angle $\ensuremath{\chi}$ of hyperboliclike encounters of two spinning black holes, at the fourth post-Newtonian approximation level for orbital effects, and at the next-to-next-to-leading order for spin-dependent effects. We find it convenient to compute the gauge-invariant scattering angle (expressed as a function of energy, orbital …