Quantitative tightness for three-dimensional contact manifolds: a sub-Riemannian approach
Through the use of sub-Riemannian metrics we provide quantitative estimates for the maximal tight neighbourhood of a Reeb orbit on a three-dimensional contact manifold. Under appropriate geometric conditions we show how to construct closed curves which are boundaries of overtwisted disks. We introdu...
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Published in | arXiv.org |
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Abstract | Through the use of sub-Riemannian metrics we provide quantitative estimates for the maximal tight neighbourhood of a Reeb orbit on a three-dimensional contact manifold. Under appropriate geometric conditions we show how to construct closed curves which are boundaries of overtwisted disks. We introduce the concept of contact Jacobi curve, and prove sharp lower bounds of the so-called tightness radius (from a Reeb orbit) in terms of Schwarzian derivative bounds. We also prove similar, but non-sharp, comparison theorems in terms of sub-Riemannian canonical curvature bounds. We apply our results to K-contact sub-Riemannian manifolds. In this setting, we prove a contact analogue of the celebrated Cartan-Hadamard theorem. |
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AbstractList | Through the use of sub-Riemannian metrics we provide quantitative estimates for the maximal tight neighbourhood of a Reeb orbit on a three-dimensional contact manifold. Under appropriate geometric conditions we show how to construct closed curves which are boundaries of overtwisted disks. We introduce the concept of contact Jacobi curve, and prove sharp lower bounds of the so-called tightness radius (from a Reeb orbit) in terms of Schwarzian derivative bounds. We also prove similar, but non-sharp, comparison theorems in terms of sub-Riemannian canonical curvature bounds. We apply our results to K-contact sub-Riemannian manifolds. In this setting, we prove a contact analogue of the celebrated Cartan-Hadamard theorem. |
Author | Agrachev, Andrei A Rizzi, Luca Bellini, Eugenio Baranzini, Stefano |
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Title | Quantitative tightness for three-dimensional contact manifolds: a sub-Riemannian approach |
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