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arXiv · 2506.02301

`Translation invariant' black hole: autoparallels and complete integrability

Jens Boos
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Abstract

We consider the autoparallel motion of test bodies in static, spherically symmetric spacetimes with torsion. We prove complete integrability of such motion for a wide range of off-shell geometries via four commuting autoparallel Killing vectors. Since these vectors reduce to translation generators in a certain limit, we refer to these geometries as `translation invariant.' Invoking the field equations of quadratic Poincar\'e gauge gravity we re-derive an exact Schwarzschild black hole solution endowed with a non-trivial torsion field scaling as $GM/r^2$, where $M$ denotes the ADM mass of the black hole. Studying the qualitative orbital dynamics via effective potentials we find notable discrepancies between autoparallels (straightest possible paths) and geodesics (shortest possible paths).

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Jens Boos. 2025-06-02. `Translation invariant' black hole: autoparallels and complete integrability. https://arxiv.org/abs/2506.02301

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