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Local-in-Time Conservative Binary Dynamics at Fifth Post-Minkowskian and First Self-Force Orders

Christoph Dlapa1,*, Gregor Kälin1,†, Zhengwen Liu2,3,‡, and Rafael A. Porto1,§

  • *Contact author: christoph.dlapa@desy.de
  • †Contact author: gregor.kaelin@desy.de
  • ‡Contact author: zhengwen.liu@seu.edu.cn
  • §Contact author: rafael.porto@desy.de
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Phys. Rev. Lett. 135, 251401 – Published 18 December, 2025

DOI: https://doi.org/10.1103/215k-27sj

Abstract

We report the local-in-time conservative dynamics of nonspinning binary systems at fifth post-Minkowskian (5PM) and first self-force (1SF) orders. This follows from an explicit calculation of the 5PM/1SF nonlocal-in-time tail-type contribution to the deflection angle via worldline effective field theory techniques. Proceeding as in Dlapa et al. [Phys. Rev. Lett. 132, 221401 (2024)], we subtract the nonlocal tail terms from the result in Driesse et al. [Phys. Rev. Lett. 132, 241402 (2024)] and reconstruct a local-in-time Hamiltonian in isotropic gauge—valid for generic orbits. For completeness, we reinstate the nonlocal terms relevant for ellipticlike motion up to 6PN/1SF in a small-eccentricity expansion. Via the connection between the (source) energy flux in Dlapa et al. [Phys. Rev. Lett. 130, 101401 (2023)] and tail effects, we also derive the SF-exact logarithmic-dependent part of the full 5PM bound Hamiltonian. Our results provide the most accurate description to date of the dynamics of bound compact objects within the framework of relativistic scattering computations.

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Nonlocal-in-time tail effects in gravitational scattering to fifth post-Minkowskian and tenth self-force orders

Christoph Dlapa, Gregor Kälin, Zhengwen Liu, and Rafael A. Porto
Phys. Rev. D 114, 024029 (2026)

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Phys. Rev. Lett. 135, 251401– Published 18 December, 2025
  • Received 17 August 2025
  • Revised 10 October 2025
  • Accepted 2 December 2025
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