- Open Access
Radiation-reaction and angular momentum loss at
Phys. Rev. D 111, 126012 – Published 17 June, 2025
DOI: https://doi.org/10.1103/xz14-87q7
Abstract
We point out that the odd-in-velocity contribution to the radiated angular momentum for two-body scattering is determined by the radiation-reaction (RR) term in the one-loop waveform. This RR term is actually proportional to the tree-level waveform, and this reduces the calculation of the odd-in-velocity contribution to the angular momentum loss, , to two loops, instead of three loops as one would expect by power counting. We exploit this simplification, which follows from unitarity, to obtain a closed-form expression for for generic velocities, which resums all fractional post-Newtonian (PN) corrections to the angular momentum loss starting at 1.5PN.
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