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Dynamics of compact binary systems in scalar-tensor theories: I. Equations of motion to the third post-Newtonian order

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arxiv 1802.10201 v4 pith:KVXK6FKC submitted 2018-02-27 gr-qc

classification gr-qc
keywords theoriesorderscalar-tensorbinarycompactdynamicsequationsgeneral
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Scalar-tensor theories are one of the most natural and well-constrained alternative theories of gravity, while still allowing for significant deviations from general relativity. We present the equations of motion of nonspinning compact binary systems at the third post-Newtonian (PN) order in massless scalar-tensor theories. We adapt the Fokker action of point particles in harmonic coordinates in general relativity to the specificities of scalar-tensor theories. We use dimensional regularisation to treat both the infrared and ultraviolet divergences, and we consistently include the tail effects that contribute by a non-local term to the dynamics. This work is crucial in order to compute the scalar gravitational waveform and the energy flux at 2PN order.

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Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Compact binary systems in Einstein-{\AE}ther gravity. II. Radiation reaction to 2.5 post-Newtonian order

    gr-qc 2025-06 conditional novelty 7.0 of 10

    The paper derives radiative equations of motion for Einstein-Aether compact binaries to 2.5PN order and reports energy-loss rates that contradict earlier flux-based calculations, with the dipole rate depending only on...

  2. Tidal contributions to the full gravitational waveform to the second-and-a-half post-Newtonian order

    gr-qc 2024-12 conditional novelty 7.0 of 10

    Tidal contributions to all gravitational waveform amplitude modes up to l=7 are derived to 2.5PN for quasi-circular non-spinning compact binaries, with flux and phasing provided at the same order.

  3. Angular momentum flux through post-Newtonian order for noncircular nonspinning black-hole binaries in Einstein-Maxwell-dilaton theory

    gr-qc 2026-07 conditional novelty 6.0 of 10

    The scalar, electromagnetic, and tensor contributions to the angular momentum flux from noncircular EMd binaries are derived through 1PN order.

  4. Quasi-Keplerian parametrization for compact binaries on hyperbolic orbits in scalar-tensor theories at second post-Newtonian order

    gr-qc 2025-04 conditional novelty 6.0 of 10

    A complete 2.5PN scattering angle for scalar-tensor hyperbolic binaries is derived from a new 2PN quasi-Keplerian parametrization, along with a corrected 3PN GR impact parameter.

  5. Tail effects of self-interacting scalar fields

    gr-qc 2024-12 conditional novelty 6.0 of 10

    Quartic scalar self-interactions produce a logarithmically running correction to the two-body force, constrain the self-coupling via solar system tests, and generate multipole-coupling tail interactions that advance t...

  6. Tidal effects in gravitational waves from neutron stars in scalar-tensor theories of gravity

    gr-qc 2024-12 conditional novelty 6.0 of 10

    Tidal contributions to neutron-star binary gravitational-wave phase in scalar-tensor gravity involve scalar, tensor, and mixed Love numbers, and generally combine to reduce the net tidal signal below the general-relat...

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