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Keywords:
pseudo-Riemannian manifold; tangent bundle; Sasaki metric; neutral metric; holonomy group; indecomposable-reducible manifold; Einstein manifold
pseudo-Riemannian manifold; tangent bundle; Sasaki metric; neutral metric; holonomy group; indecomposable-reducible manifold; Einstein manifold
Summary:
We provide the tangent bundle $TM$ of pseudo-Riemannian manifold $(M,g)$ with the Sasaki metric $g^s$ and the neutral metric $g^n$. First we show that the holonomy group $H^s$ of $(TM ,g^s)$ contains the one of $(M,g)$. What allows us to show that if $(TM ,g^s)$ is indecomposable reducible, then the basis manifold $(M,g)$ is also indecomposable-reducible. We determine completely the holonomy group of $(TM ,g^n)$ according to the one of $(M,g)$. Secondly we found conditions on the base manifold under which $(TM ,g^s)$ ( respectively $(TM ,g^n)$ ) is Kählerian, locally symmetric or Einstein manifolds. $(TM ,g^n)$ is always reducible. We show that it is indecomposable if $(M,g)$ is irreducible.
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