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NNNLO gravitational quadratic-in-spin interactions at the quartic order in G

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arxiv 2003.07890 v3 pith:K557BH7L submitted 2020-03-17 hep-th gr-qc

NNNLO gravitational quadratic-in-spin interactions at the quartic order in G

classification hep-th gr-qc
keywords sectororderspinningcurvatureexpansiongravitationalinteractionsobjects
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We compute the N$^3$LO gravitational quadratic-in-spin interactions at $G^4$ in the post-Newtonian (PN) expansion via the effective field theory (EFT) of gravitating spinning objects for the first time. This result contributes at the $5$PN order for maximally-spinning compact objects, adding the spinning case to the static sector at this PN accuracy. This sector requires extending the EFT of a spinning particle beyond linear order in the curvature to include higher-order operators quadratic in the curvature that are relevant at this PN order. We make use of a diagrammatic expansion in the worldline picture, and rely on our recent upgrade of the \texttt{EFTofPNG} code, which we further extend to handle this sector. Similar to the spin-orbit sector, we find that the contributing three-loop graphs give rise to divergences, logarithms, and transcendental numbers. However, in this sector all of these features conspire to cancel out from the final result, which contains only finite rational terms.

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Cited by 5 Pith papers

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