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Riemannian Geometry of Contact and Symplectic Manifolds

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TLDR
In this article, the authors describe a complex geometry model of Symplectic Manifolds with principal S1-bundles and Tangent Sphere Bundles, as well as a negative Xi-sectional Curvature.
Abstract
Preface * 1. Symplectic Manifolds * 2. Principal S1-bundles * 3. Contact Manifolds * 4. Associated Metrics * 5. Integral Submanifolds and Contact Transformations * 6. Sasakian and Cosymplectic Manifolds * 7. Curvature of Contact Metric Manifolds * 8. Submanifolds of Kahler and Sasakian Manifolds * 9. Tangent Bundles and Tangent Sphere Bundles * 10. Curvature Functionals and Spaces of Associated Metrics * 11. Negative Xi-sectional Curvature * 12. Complex Contact Manifolds * 13. Additional Topics in Complex Geometry * 14. 3-Sasakian Manifolds * Bibliography * Subject Index * Author Index

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TL;DR: In this paper, the authors studied the natural almost CR structure on the total space of a subbundle of hyperquadrics of the tangent bundle T(M) over a semi-Riemannian manifold (M, g).
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Almost formality of quasi-Sasakian and Vaisman manifolds with applications to nilmanifolds

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Ricci almost solitons and contact geometry

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Generalized (κ, µ)-space forms and d-homothetic deformations

TL;DR: In this article, the Da-homothetic deformations of generalized (κ, μ)space forms are studied, and it is shown that the deformed spaces are again generalized (k, μ)-space forms in dimension 3, but not in general.