From Bertotti–Robinson to vacuum: New exact solutions in general relativity via Harrison and Inversion symmetries
Year: 2026
Type: article
Abstract: We construct new vacuum solutions of the Einstein equations generated from electrovacuum configurations embedded in external electromagnetic backgrounds. Starting from accelerating Bertotti–Robinson black holes, we exploit two independent symmetries of the electrovacuum: a Melvin–Bonnor-type magnetization and a magnetic Inversion. In both constructions, the external electromagnetic field can be removed while still leaving a non-trivial gravitational backreaction in the metric, yielding new accelerating vacuum spacetimes of Petrov type I. In the static, non-accelerating limit, the magnetized Bertotti–Robinson–Schwarzschild case reproduces known results, while the Inversion symmetry produces a genuinely new vacuum configuration, a two-parameter extension of the Schwarzschild–Levi-Civita geometry. These constructions provide a systematic method for generating algebraically general vacuum geometries and illustrate how electromagnetic embeddings can induce non-trivial vacuum metrics in General Relativity. The main geometrical properties of these spacetimes are analyzed. Additionally, we present two further results: a stationary generalization of these vacuum geometries and two new static vacuum configurations obtained by applying the same symmetries to the Alekseev–García black hole seed.
Source: Physics Letters B
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: G1741043573, SCALAR-TENSOR THEORIES AND SOLUTION GENERATING TECHNIQUES AT WORK: ENHANCING THE STUDY OF EXACT BLACK HOLES SPACETIMES IN MODIFIED GRAVITY, G3967893287, G5475215707, G6755466268, THE MANY FACES OF HAIRY BLACK HOLES BACK TO MINIMALLY AND CONFORMALLY COUPLED SCALAR--TENSOR THEORIES
OpenAlex ID: W7130714604