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Perturbative Quantum Gravity as a Double Copy of Gauge Theory
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In a previous paper we observed that (classical) tree-level gauge theory amplitudes can be rearranged to display a duality between color and kinematics. Once this is imposed, gravity amplitudes are obtained using two copies of gauge-theory diagram numerators. Here we conjecture that this duality persists to all quantum loop orders and can thus be used to obtain multiloop gravity amplitudes easily from gauge-theory ones. As a nontrivial test, we show that the three-loop four-point amplitude of N = 4 super-Yang-Mills theory can be arranged into a form satisfying the duality, and by taking double copies of the diagram numerators we obtain the corresponding amplitude of N = 8 supergravity. We also remark on a non-supersymmetric two-loop test based on pure Yang-Mills theory resulting in gravity coupled to an anti-symmetric tensor and dilaton.
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Gravitational bremsstrahlung waveform at the eighth post-Minkowskian order in the extreme-mass-ratio limit
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Light-Front approach to $4d$ massless Higher-Spin interactions
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Entire Four-Graviton EFT from the Duality Between Color and Kinematics
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Generalized Unitarity Method for Worldline Field Theory
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Gleaning gravitational amplitudes -- a double copy for canceling dilatons
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From noncommutative Yang-Mills to noncommutative gravity through a classical double copy map
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HEFT Numerators from Kinematic Algebra
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The Many Colours of Amplitudes
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One-Loop Observables to Higher Order in Spin
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UV considerations on scattering amplitudes in a web of theories
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Shift symmetries, soft limits, and the double copy beyond leading order
For higher-derivative corrections, shift symmetry no longer guarantees double-copy compatibility; even-point amplitudes can be made compatible by tuning coefficients, odd-point ones cannot.
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Perturbiner methods in scattering amplitude
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