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Homotheties and topology of tangent sphere bundles

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Abstract

We prove a Theorem on homotheties between two given tangent sphere bundles S r M of a Riemannian manifold M, g of \({{\rm dim}\geq3}\), assuming different variable radius functions r and weighted Sasaki metrics induced by the conformal class of g. New examples are shown of manifolds with constant positive or with constant negative scalar curvature which are not Einstein. Recalling results on the associated almost complex structure I G and symplectic structure \({\omega^G}\) on the manifold TM, generalizing the well-known structure of Sasaki by admitting weights and connections with torsion, we compute the Chern and the Stiefel–Whitney characteristic classes of the manifolds TM and S r M.

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Correspondence to R. Albuquerque.

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The author acknowledges the support of Fundação Ciência e Tecnologia, Portugal, Centro de Investigação em Matemática e Aplicações da Universidade de Évora (CIMA-UE) and the sabbatical grant SFRH/BSAB/895/2009

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Albuquerque, R. Homotheties and topology of tangent sphere bundles. J. Geom. 105, 327–342 (2014). https://doi.org/10.1007/s00022-014-0210-x

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  • DOI: https://doi.org/10.1007/s00022-014-0210-x

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