We compute the nonlinear far-zone dynamics of compact binaries at the sixth post-Newtonian (6PN) order in the effective field theory of general relativity. We derive the complete O(G2) far-zone action of a generic multipolar source in both the causal and the conservative prescriptions. Besides the known tails and failed tails, it contains five new sectors generated by the nonlinear memory of the emitted waves. On scattering orbits, they contain a boundary term, nonlocal in time, fixed by the balance of angular momentum. The same construction yields the emitted waveforms, whose energy and angular-momentum fluxes balance the losses of the action. For the binary, the 6PN dynamics also requires PN corrections to the lower-order sectors, the iterated radiation reaction, and a coupling quadratic in the curvature of the composite source, whose coefficient we fix by matching the gravitational Compton amplitude to that of the constituents. We compute the two-radiation contributions to the total scattering angle at fourth, fifth and sixth post-Minkowskian (PM) order and to the conservative angle at 4PM and 5PM, retaining the integer-PN terms through 6PN. For the conservative angle, we give both the local and γ-3 prescriptions. Combined with the tail and the known potential contributions, our results reproduce the conservative and total 4PM angles and the second-self-force part of the conservative 5PM angle. Including the dissipative tail, we recover the total 5PM angle through 5PN and determine its new 6PN coefficient. At 6PM, the two-radiation contribution to the total angle extends the known 5PN result to 6PN.
Introduction
Gravitational waves from coalescing compact objects [1, 2, 3] carry a direct imprint of the relativistic two-body dynamics. The sensitivity of the next generation of detectors [4, 5, 6] increases the need for accurate predictions of the dynamics and radiation of compact binaries [7, 8, 9]. During the inspiral phase, the orbital velocity v is small compared to the speed of light c, and the dynamics admits the post-Newtonian (PN) expansion [10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67]. An nPN correction is suppressed by (v/c)2n relative to the Newtonian result. This phase is characterised by a separation of scales between the sizes of the compact objects, the orbital separation, and the wavelength of the emitted radiation. This separation of scales is organised by a tower of effective field theories (EFTs) [12, 14, 24, 68, 69, 70]: potential graviton modes mediate the near-zone orbital interaction, while radiation graviton modes propagate to infinity. In the far zone, the binary is described as a composite source with a mass, angular momentum and multipole moments [59, 60].
Multi-loop methods from quantum field theory have carried these EFTs to high PN orders [28, 31]. The complete binary dynamics has been determined at 4PN [16, 17, 20, 71, 72], also within the EFT approach [30, 31, 32, 33]. The 5PN impulse and scattering angle of the binary have recently been computed [73], combining the near-zone potential [37, 38, 40, 41] with the far-zone in-in action [42]. This also fixes the two coefficients left undetermined in the 5PN Hamiltonian of Ref. [74]. At 6PN, only partial results are known: the conservative potential up to O(G4)[34, 43], the local- and nonlocal-in-time dynamics accessible through the self-force expansion [75, 76], and the static O(G7) contribution [77], extended to O(G8) at 7PN [78].
Complementary information comes from scattering orbits, where the dynamics can be expanded in GM/b, with M the total mass and b the impact parameter, retaining the full velocity dependence: this is the post-Minkowskian (PM) expansion [79, 80, 81, 82]. This expansion has been pushed to high orders with scattering-amplitude [83, 84, 85] and worldline [86, 87, 88, 89] methods. The conservative scattering angle is known at 3PM [90, 91, 92, 93, 94] and 4PM [95, 96, 97, 98, 99, 100]. Radiation-reaction effects on the scattering angle are known at 3PM [88, 101, 102, 103, 104, 105] and 4PM [106, 107, 108]. The radiated momentum is known at 3PM [88, 103, 109] and 4PM [106], and the loss of angular momentum through 3PM [101, 105, 110, 111] and at 4PM [112, 113, 114]. At 5PM, the conservative angle is known at first [115, 116, 117, 118] and second [119] self-force order, and in the potential region [120]. Its nonlocal-in-time tail contribution is known through tenth self-force order [121]. The radiation-reacted angle, the radiated energy and the recoil are known at 5PM at first self-force order [117]. In the PN expansion, radiation-reaction effects start at 2.5PN [122, 123, 124]. They were derived in the EFT framework in Ref. [125] and extended to 3.5PN [126, 127] and 4.5PN [128]. At higher orders, radiation interacts with the gravitational field of the source and with itself. These hereditary effects depend on the entire past history of the source. Scattering off the mass of the source produces the tail terms, which first enter the dynamics at 4PN [129, 130], and their iterations, the tails of tails, at 5.5PN [131]. Scattering off the angular momentum produces the failed tail terms [42, 132, 133, 134]. Interactions among the emitted waves generate gravitational-wave memory terms [130, 135, 136, 137, 138, 139]. In the multipolar post-Minkowskian (MPM) formalism, these effects are known in the flux and phasing of quasi-circular binaries through 4.5PN order and in the waveform modes through 4PN order [11, 21, 22]. In the EFT, causal forces and radiative observables are studied with the closed-time-path (in-in) formalism [125, 140, 141, 142, 143, 144]. The 4PN tail was derived in the EFT in Refs. [36, 145], and the 5PN hereditary terms were studied in Refs. [41, 132, 133, 146, 147, 148, 149]. The complete 5PN in-in effective action was obtained in Ref. [42], including the nonlocal boundary terms of the memory contribution. In the far zone at 6PN only the tails and failed tails are known for general multipoles [134, 150].
In this work, we compute the nonlinear far-zone contribution to the dynamics of two non-spinning point masses at 6PN. We first derive, from a Berends–Giele recursion for the in-in one-point function, the complete O(G2) far-zone action of a generic source, which contains eleven sectors: two tails, four failed tails and five memories. We reproduce the known tail and failed-tail results [134, 150] and compute the five memory actions in both the causal and the conservative prescriptions. On scattering orbits, they contain in addition a boundary term, nonlocal in time, fixed by the balance of angular momentum, in which the nonlinear memory of the emitted waves [130, 135, 136, 137] acts on the change of the mass multipoles. From the same generating functional we compute the nonlinear waveforms, whose stress tensor is conserved up to the recoil of the source. We verify that the radiated energy and angular momentum balance the losses predicted by the action at generic frequencies, while the zero-frequency part of the angular-momentum flux reproduces the coefficients of the boundary term.
The far-zone action of a generic source is not yet the far-zone contribution to the binary dynamics. The multipoles are matched to the near-zone dynamics [59, 60], the lower-order far-zone sectors are evaluated with PN-corrected multipoles and motion [66, 76, 146, 151, 152, 153], and the radiation-reaction forces are iterated in the equations of motion, which generates conservative-like contributions at second order in the leading force [42]. A coupling quadratic in the electric curvature of the composite source also enters, which the covariant multipolar couplings do not generate. We fix its coefficient by matching the gravitational Compton amplitude of the multipoles to that of the constituents.
We compute the two-radiation contributions to the total scattering angle at 4PM, 5PM and 6PM and to the conservative angle at 4PM and 5PM, retaining the integer-PN terms through 6PN. The conservative results are given in both the local and γ-3 prescriptions [73, 119].
At 4PM, combining the two-radiation contributions with the tail evaluated in dimensional regularisation and the known potential [33, 43], we reproduce both the conservative and the total angle [96, 99, 106] through 6PN.
At 5PM, the conservative angle depends on the prescription used to separate it, while the total angle does not. After adding the potential region [120] and the conservative tail, the local result agrees with Ref. [73] at 5PN and extends it to 6PN. The γ-3 result agrees with Ref. [119] at second self-force order through 6PN. In both prescriptions, the cubic terms in the symmetric mass ratio ν cancel. Combining the retarded two-radiation contribution with the potential and tail contributions, including the dissipative tail, gives the total 5PM angle at orders ν2 and ν3 through 6PN. The 5PN result agrees with Ref. [73], while the 6PN ν2 coefficient is new and the ν3 coefficient agrees with Ref. [117].
At 6PM, we give the two-radiation contribution to the total angle. It reproduces the 5PN result of Ref. [73] and extends it to 6PN.
Conventions. We work in dimensional regularisation with D=d+1 space-time dimensions, d=3−2ε, in the mostly-minus signature ημν=diag(+,…,−), and we set c=1. The gravitational coupling is denoted by κ=32πG, with G Newton’s constant. We use shorthand notation for integrals
∫k≡μ2ε∫(2π)DdDk,∫p≡μ2ε∫(2π)dddp,(1)
where bold notation denotes spatial loop momenta, and μ is the scale introduced by dimensional regularisation. We define the scale μˉ as
Multi-index notation L=i1⋯iℓ is used for the symmetric trace-free (STF) multipoles, and spatial indices are contracted with the Euclidean metric. Angular brackets on indices, as in X⟨L⟩, or a superscript STF on a product denote the STF projection. Time derivatives are denoted by dots or by superscripts, X(n)=dnX/dtn, and ΔX≡X(+∞)−X(−∞) is the change of a quantity over a scattering history.
Far-zone effective theory and in-in observables
The far-zone theory describes the binary as a multipolar source coupled to the radiation field. We specify its action and Feynman rules, then construct the causal in-in effective action and the one-point function using recursion relations. We introduce power counting relations to identify the diagrams relevant at 6PN order.
From the binary to the far-zone source
The inspiral phase of a compact binary coalescence is characterised by a hierarchy of length scales,
R≪r≪λGW,(4)
where R is the characteristic size of each compact object, r the orbital separation and λGW the radiation wavelength. For compact objects, R∼GM/c2, and the virial theorem for bound orbits gives v2/c2∼GM/(rc2), so that R/r∼v2/c2. Since the radiation is emitted at the orbital frequency, r/λGW∼v/c. Hence, all scales are related by the small parameter v/c≪1, which defines the post-Newtonian (PN) expansion. This hierarchy allows the problem to be studied with a tower of EFTs, one for each scale [24, 59] (see Refs. [12, 14, 70] for comprehensive reviews). At distances larger than R, each body is represented by a worldline, with its internal structure encoded in finite-size operators. At the orbital scale r, the two worldlines interact through the exchange of gravitational fields, described by the action
Snear=Sbulk+a=1∑2Spp(a).(5)
where Spp(a) is the point-particle action
Spp(a)=−ma∫dλgμνuaμuaν,(6)
with ma the mass of body a, λ a worldline parameter and uaμ=dxaμ/dλ its four-velocity. The bulk gravitational dynamics is governed by the Einstein–Hilbert action with the harmonic gauge-fixing term,
Sbulk=SEH+Sgf=∫dDx[−κ22−gR+κ21GμGμ],(7)
where Gμ=κ(∂αhαμ−21∂μh) is written in terms of the graviton field, defined by expanding the metric around flat space-time,
gμν=ημν+κhμν.(8)
The graviton modes do not scale homogeneously with the velocity v. Potential modes Hμν, with momenta kμ∼(v/r,1/r), are off shell and mediate the orbital interaction. Radiation modes hˉμν, with momenta kμ∼(v/r,v/r), propagate on shell to infinity,
hμν=Hμν+hˉμν.(9)
This separation implements the method of regions [154] in the two-body problem [24], and is well defined in dimensional regularisation, where the scaleless integrals that would mix the regions vanish. The two effective theories that result are tied to each other by the cancellation of the ultraviolet poles of the far zone against the infrared poles of the near zone [27, 32, 33, 71].
Far-zone source action
We integrate out the potential modes while retaining the orbital variables and treating the radiation field as a background. Since kradr∼v≪1, the radiation field does not resolve the orbital scale, and its coupling is organised as a multipole expansion about the centre of mass,
eiSeff[xa,hˉ]=∫DHeiSnear[xa,H+hˉ],
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