Classical Gravitational Spinning-Spinless Scattering at <math display="inline"><mrow><mi mathvariant="script">O</mi><mo stretchy="false">(</mo><msup><mrow><mi>G</mi></mrow><mrow><mn>2</mn></mrow></msup><msup><mrow><mi>S</mi></mrow><mrow><mi>∞</mi></mrow></msup><mo stretchy="false">)</mo></mrow></math>

Tourinho Jadallah Aoude, Rafael;et.al.
(2022) Physical Review Letters — Vol. 129 (2022)

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Making use of the recently derived, all-spin, opposite-helicity Compton amplitude, we calculate the classical gravitational scattering amplitude for one spinning and one spinless object at <math display="inline"><mi mathvariant="script">O</mi><mo stretchy="false">(</mo><msup><mi>G</mi><mn>2</mn></msup><mo stretchy="false">)</mo></math> and all orders in spin. By construction, this amplitude exhibits the spin structure that has been conjectured to describe Kerr black holes. This spin structure alone is not enough to fix all deformations of the Compton amplitude by contact terms, but when combined with considerations of the ultrarelativistic limit we can uniquely assign values to the parameters remaining in the even-in-spin sector. Once these parameters are determined, much of the spin dependence of the amplitude resums into hypergeometric functions. Finally, we derive the eikonal phase for aligned-angular-momentum scattering.
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Tourinho Jadallah Aoude, R., & et al. (2022). Classical Gravitational Spinning-Spinless Scattering at <math display=“inline”><mrow><mi mathvariant=“script”>O</mi><mo stretchy=“false”>(</mo><msup><mrow><mi>G</mi></mrow><mrow><mn>2</mn></mrow></msup><msup><mrow><mi>S</mi></mrow><mrow><mi>∞</mi></mrow></msup><mo stretchy=“false”>)</mo></mrow></math>. Physical Review Letters, 129. https://doi.org/10.1103/PhysRevLett.129.141102 (Original work published 2022)