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- W3204331475 abstract "A bstract The quantum field-theoretic approach to classical observables due to Kosower, Maybee and O’Connell provides a rigorous pathway from on-shell scattering amplitudes to classical perturbation theory. In this paper, we promote this formalism to describe general classical spinning objects by using coherent spin states. Our approach is fully covariant with respect to the massive little group SU(2) and is therefore completely synergistic with the massive spinor-helicity formalism. We apply this approach to classical two-body scattering due gravitational interaction. Starting from the coherent-spin elastic-scattering amplitude, we derive the classical impulse and spin kick observables to first post-Minkowskian order but to all orders in the angular momenta of the massive spinning objects. From the same amplitude, we also extract an effective two-body Hamiltonian, which can be used beyond the scattering setting. As a cross-check, we rederive the classical observables in the center-of-mass frame by integrating the Hamiltonian equations of motion to the leading order in Newton’s constant." @default.
- W3204331475 created "2021-10-11" @default.
- W3204331475 creator A5037718722 @default.
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- W3204331475 date "2021-10-01" @default.
- W3204331475 modified "2023-09-30" @default.
- W3204331475 title "Classical observables from coherent-spin amplitudes" @default.
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- W3204331475 doi "https://doi.org/10.1007/jhep10(2021)008" @default.
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