Classical double copy in the black hole mini-superspace
arXiv:2404.09374 · doi:10.1016/j.aop.2025.170133
Abstract
We give a novel formulation of classical double copy in the mini-superspace of static, spherically symmetric black holes where the map between the solutions of general relativity and Maxwell's theory can be realized in Boyer-Lindsquit coordinates. By employing the reduced action principle, we show that the double copy structure can be generalized to Lovelock gravities and quasi-topological gravities. However, the gravitational solutions are mapped to the purely electric solutions of Maxwell's theory with a difference: instead of a direct match between the Kerr-Schild scalar in the gravity side and the scalar potential in the gauge theory side, the scalar potential becomes a polynomial in the Kerr-Schild scalar, giving rise to a generalization of the Kerr-Schild double copy. We calculate the Regge-Teitelboim surface charges and prove that the mass of the black hole solution is identified with the electric charge corresponding to the Coulomb part of the gauge theory solution in the same way it does in the case of general relativity.
Version published in AoP
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