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Third-and-a-half order post-Newtonian equations of motion for relativistic compact binaries using the strong field point particle limit

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arxiv 0911.4232 v1 pith:DCKLPXCY submitted 2009-11-22 gr-qc

classification gr-qc
keywords motionequationsorderbinariescompactdescribefieldlimit
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We report our rederivation of the equations of motion for relativistic compact binaries through the third-and-a-half post-Newtonian (3.5 PN) order approximation to general relativity using the strong field point particle limit to describe self-gravitating stars instead of the Dirac delta functional. The computation is done in harmonic coordinates. Our equations of motion describe the orbital motion of the binary consisting of spherically symmetric non-rotating stars. The resulting equations of motion fully agree with the 3.5 PN equations of motion derived in the previous works. We also show that the locally defined energy of the star has a simple relation with its mass up to the 3.5 PN order.

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Cited by 3 Pith papers

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  1. Schott term in the binding energy for compact binaries on circular orbits at fourth post-Newtonian order

    gr-qc 2025-04 conditional novelty 8.0 of 10

    At 4PN order, the binding energy in the flux-balance law differs from the conservative energy by a hereditary 'pseudo-Schott' term, which exactly reproduces the previously postulated energy-frequency relation and conf...

  2. Accurate waveforms for generic planar-orbit binary black holes: The multipolar effective-one-body model SEOBNRv6EHM

    gr-qc 2026-05 unverdicted novelty 7.0 of 10

    SEOBNRv6EHM is a multipolar EOB model for eccentric planar-orbit BBHs calibrated to NR simulations, showing low waveform mismatches up to eccentricity 0.9.

  3. Gravitational radiation reaction for compact binary systems at the fourth-and-a-half post-Newtonian order in harmonic coordinates

    gr-qc 2026-01 conditional novelty 7.0 of 10

    The 4.5PN radiation-reaction acceleration of nonspinning compact binaries is derived in harmonic coordinates, including a dimensional-regularization pole, and is shown to satisfy flux-balance laws and Lorentz invariance.

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