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arXiv · 2511.11136

Near-Horizon Symmetries in Einstein-Maxwell theory

Gianfranco De Simone
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Abstract

This manuscript aims to provide a comprehensive derivation of the Einstein-Maxwell charges and fluxes in the near-horizon region of a four-dimensional non-extremal black hole, with vanishing cosmological constant. Specifically, we present a detailed derivation of the Noether charges within both the metric and first-order formulations, elucidating the relationship between the Carrollian internal boost charge and the Lorentz boost charge. It is well-established in the literature that Carrollian fluids exhibit an internal local boost symmetry; we demonstrate that this symmetry precisely corresponds to a Lorentz internal transformation. Finally, we prove that the near-horizon Einstein equations can be obtained from the flux-balance law by employing the generalized Barnich-Troessaert bracket.

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Gianfranco De Simone. 2025-11-14. Near-Horizon Symmetries in Einstein-Maxwell theory. https://doi.org/10.1088/1402-4896/ae858a

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