Abstract
Building upon recent progress in applying on-shell amplitude techniques to classical observables in general relativity, we propose a closed-form formula for the conservative Hamiltonian of a spinning binary system at the 1st post-Minkowskian (1PM) order. It is applicable for general compact spinning bodies with arbitrary spin multipole moments. The formula is linear in gravitational constant by definition, but exact to all orders in momentum and spin expansions. At each spin order, our formula implies that the spin-dependence and momentum dependence factorize almost completely. We expand our formula in momentum and compare the terms with 1PM parts of the post-Newtonian computations in the literature. Up to canonical transformations, our results agree perfectly with all previous ones. We also compare our formula for black hole to that derived from a spinning test-body near a Kerr black hole via the effective one-body mapping, and find perfect agreement.
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Chung, MZ., Huang, Yt., Kim, JW. et al. Complete Hamiltonian for spinning binary systems at first post-Minkowskian order. J. High Energ. Phys. 2020, 105 (2020). https://doi.org/10.1007/JHEP05(2020)105
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DOI: https://doi.org/10.1007/JHEP05(2020)105