Abstract
We extend the Gallot–Tanno theorem to closed pseudo-Riemannian manifolds. It is done by showing that if the cone over a manifold admits a parallel symmetric (0, 2)-tensor then it is Riemannian. Applications of this result to the existence of metrics with distinct Levi-Civita connections but having the same unparametrized geodesics and to the projective Obata conjecture are given. We also apply our result to show that the holonomy group of a closed (O(p + 1, q), S p,q)-manifold does not preserve any nondegenerate splitting of \({\mathbb {R}^{p+1,q}}\).
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Vladimir S. Matveev—partially supported by DFG (SPP 1154 and GK 1523).
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Matveev, V.S., Mounoud, P. Gallot–Tanno theorem for closed incomplete pseudo-Riemannian manifolds and applications. Ann Glob Anal Geom 38, 259–271 (2010). https://doi.org/10.1007/s10455-010-9211-7
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DOI: https://doi.org/10.1007/s10455-010-9211-7