Double copy, Kerr-Schild gauges and the Effective-One-Body formalism - Archive ouverte HAL
Article Dans Une Revue Class.Quant.Grav. Année : 2025

Double copy, Kerr-Schild gauges and the Effective-One-Body formalism

Résumé

We look for a classical double copy structure between gravity and electrodynamics by connecting the descriptions of the scattering of two point masses, and of two point charges, in terms of perturbative (post-Minkowskian or post-Lorentzian) expansions. We do so by recasting available analytical information within the effective-one-body formalism using Kerr-Schild gauges in both cases. Working at the third perturbative level, we find that the usual linear relation (holding in the probe limit) between the dimensionless electric potential, $\tilde{\phi}= \frac{G M}{e_1 e_2} \phi^{\rm el}$, and the Schwarzschildlike gravitational one, $\Phi^{\rm grav}$, is deformed, in the comparable-mass, comparable-charge, case, into a nonlinear relation which becomes universal in the high energy limit: $\Phi^{\rm grav}= 2\tilde{\phi}-5\tilde{\phi}^2 + 18\tilde{\phi}^3$.

Dates et versions

hal-04356141 , version 1 (20-12-2023)

Identifiants

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Anna Ceresole, Thibault Damour, Alessandro Nagar, Piero Rettegno. Double copy, Kerr-Schild gauges and the Effective-One-Body formalism. Class.Quant.Grav., 2025, 42 (2), pp.025004. ⟨10.1088/1361-6382/ad987f⟩. ⟨hal-04356141⟩
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