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arXiv · 2610.05798

Einstein--Maxwell Sum Rules and the Persistence of the Smooth-Brane No-Go Theorem

Paulo Michel Longo Tavares da Silva
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Abstract

We investigate whether a minimally coupled Abelian Maxwell sector can relax the Gibbons--Kallosh--Linde (GKL) obstruction to smooth five-dimensional warped braneworlds. For a canonical scalar field coupled to a bulk Maxwell field, we derive the one-parameter family of global consistency conditions while keeping the tangential F_{μν} and mixed F_{μ5} sectors separate. This decomposition is essential because the Maxwell stress tensor is not traceless in five dimensions. We show that electromagnetic terms formally modify the integrated GKL constraints, but this modification does not provide a consistent evasion of the no-go theorem under the standard assumptions. Exact four-dimensional Poincaré invariance excludes a nonzero deterministic classical Maxwell field from the background, since its field strength would select preferred four-dimensional directions. The Maxwell sector therefore vanishes in the symmetric background and the usual smooth-brane obstruction is recovered. We also identify which assumptions must be relaxed for a nontrivial electromagnetic contribution and distinguish this background result from local consistency conditions for bulk gauge-field localization.

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Paulo Michel Longo Tavares da Silva. 2026-10-05. Einstein--Maxwell Sum Rules and the Persistence of the Smooth-Brane No-Go Theorem. https://arxiv.org/abs/2610.05798

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