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Projective Vector Fields on Semi-Riemannian Manifolds
Version 1
: Received: 27 August 2024 / Approved: 28 August 2024 / Online: 28 August 2024 (10:37:59 CEST)
How to cite: Alshehri, N.; Guediri, M. Projective Vector Fields on Semi-Riemannian Manifolds. Preprints 2024, 2024081990. https://doi.org/10.20944/preprints202408.1990.v1 Alshehri, N.; Guediri, M. Projective Vector Fields on Semi-Riemannian Manifolds. Preprints 2024, 2024081990. https://doi.org/10.20944/preprints202408.1990.v1
Abstract
This paper explores the properties of projective vector fields on semi-Riemannian manifolds. The main result establishes that if a projective vector field η on such a manifold is also a conformal vector field with potential function ψ, then η must either be homothetic, or the vector field ζ, which is dual to dψ, is a light-like vector field. Additionally, it is shown that a complete Riemannian manifold admits a projective vector field that is also conformal and non-Killing if and only if it is locally Euclidean. The paper also presents other results related to the characterization of Killing and parallel vector fields using the Ricci curvature and the Hessian of the function given by the inner product of the vector field.
Keywords
Semi-Riemannian manifolds; Projective vector fields; Conformal and Killing vector fields; Ricci curvature; Hessian
Subject
Computer Science and Mathematics, Geometry and Topology
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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