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Riemannian Geometry of Contact and Symplectic Manifolds

08 Jan 2002-
TL;DR: 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: A coherent state transform provides a model for neural activity maps in the primary visual cortex, that are then described in terms of minimal uncertainty states.
Abstract: The uncertainty principle of SE(2) allows to construct a coherent states transform that is strictly related to the Bargmann transform for the group H 2 . The corresponding target space is characterized constructively and related to the almost complex structure of SE(2) as a contact manifold. Such a coherent state transform provides a model for neural activity maps in the primary visual cortex, that are then described in terms of minimal uncertainty states. The results of the model are compared with the experimental measurements.

5 citations


Cites background or result from "Riemannian Geometry of Contact and ..."

  • ...This is not trivial, since the dimension of SE(2) is odd, and hence it can carry only an almost complex structure [6]: analyticity is then replaced by the weaker CR condition [4]....

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  • ...If we denote by H the n-th Heisenberg group [14, 20] in its semidirect product form Rq o (Rp × Rt), defined by the group law (p′, q′, t′) · (p, q, t) = (p′ + p, q′ + q, t′ + t+ p′q) we note that, by an argument analogous to the one expressed for SE(2), we can associate to it a contact structure in the Darboux normal form [2, 6] ω0 = pdq − dt in accordance with the notion of H as a central extension of the commutative R....

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  • ...The complex differentiability relies instead on the almost complex structure that can be associated to SE(2) as a contact manifold [6], and tells that PFΩ is a space of CR functions [4]....

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  • ...This last one is not orientable and hence can not carry a global contact form [6], but it is useful to note that it arises naturally as the projectivization of the four dimensional phase space [2]....

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Journal ArticleDOI
TL;DR: In this paper, it was shown that a nearly-Kenmotsu manifold is locally isometric to the warped product of a real line and a nearly Kahler manifold, and that a normal nearly-Kanazawa manifold is also a KG.
Abstract: We prove that a nearly Kenmotsu manifold is locally isometric to the warped product of a real line and a nearly Kahler manifold. As consequence, a normal nearly Kenmotsu manifold is Kenmotsu. Furthermore, we show that there do not exist nearly Kenmotsu hypersurfaces of nearly Kahler manifolds.

5 citations

Journal ArticleDOI
25 Mar 2016
TL;DR: In this article, the authors classify conformally flat Kenmotsu 3-manifolds and cosympletic 3-mansifolds as well as 3-dimensional cosymptotics.
Abstract: We classify conformally flat Kenmotsu 3-manifolds and classify conformally flat cosympletic 3-manifolds.

5 citations


Cites background from "Riemannian Geometry of Contact and ..."

  • ...For more details about almost contact Riemannian manifolds, we refer to [2]....

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Journal ArticleDOI
18 Apr 2019-Symmetry
TL;DR: The aim of this paper is to provide two classification theorems concerning real hypersurfaces in non-flat complex space forms in terms of ∗ -Weyl curvature tensor, which are based on tools from differential geometry and solving systems of differential equations.
Abstract: In this paper the notion of ∗ -Weyl curvature tensor on real hypersurfaces in non-flat complex space forms is introduced. It is related to the ∗ -Ricci tensor of a real hypersurface. The aim of this paper is to provide two classification theorems concerning real hypersurfaces in non-flat complex space forms in terms of ∗ -Weyl curvature tensor. More precisely, Hopf hypersurfaces of dimension greater or equal to three in non-flat complex space forms with vanishing ∗ -Weyl curvature tensor are classified. Next, all three dimensional real hypersurfaces in non-flat complex space forms, whose ∗ -Weyl curvature tensor vanishes identically are classified. The used methods are based on tools from differential geometry and solving systems of differential equations.

5 citations

Posted Content
TL;DR: In this paper, the necessary and sufficient conditions for f-biharmonicity and bi-f-harmonicity of submanifolds in generalized complex and Sasakian space forms were studied.
Abstract: We study f-biharmonic and bi-f-harmonic submanifolds in both generalized complex and Sasakian space forms. We prove necessary and sufficient condition for f-biharmonicity and bi-f-harmonicity in the general case and many particular cases. Some non-existence results are also obtained.

5 citations


Cites background from "Riemannian Geometry of Contact and ..."

  • ...For more details, one can refer to ([1, 5, 36]) for instance....

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