Legendrian non-isotopic unit conormal bundles in high dimensions
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arXiv
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866910018183364608 |
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| author | Okamoto, Yukihiro |
| author_facet | Okamoto, Yukihiro |
| contents | For any compact connected submanifold $K$ of $\mathbb{R}^n$, let $Λ_K$ denote its unit conormal bundle, which is a Legendrian submanifold of the unit cotangent bundle of $\mathbb{R}^n$. In this paper, we give examples of pairs $(K_0,K_1)$ of compact connected submanifolds of $\mathbb{R}^n$ such that $Λ_{K_0}$ is not Legendrian isotopic to $Λ_{K_1}$, although they cannot be distinguished by classical invariants. Here, $K_1$ is the image of an embedding $ι_f \colon K_0 \to \mathbb{R}^n$ which is regular homotopic to the inclusion map of $K_0$ and the codimension in $\mathbb{R}^n$ is greater than or equal to $4$. As non-classical invariants, we define the strip Legendrian contact homology and a coproduct on it under certain conditions on Legendrian submanifolds. Then, we give a purely topological description of these invariants for $Λ_K$ when the codimension of $K$ is greater than or equal to $4$. The main examples $Λ_{K_0}$ and $Λ_{K_1}$ are distinguished by the coproduct, which is computed by using an idea of string topology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_15936 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Legendrian non-isotopic unit conormal bundles in high dimensions Okamoto, Yukihiro Symplectic Geometry Geometric Topology 53D42, 57R17, 55P50 For any compact connected submanifold $K$ of $\mathbb{R}^n$, let $Λ_K$ denote its unit conormal bundle, which is a Legendrian submanifold of the unit cotangent bundle of $\mathbb{R}^n$. In this paper, we give examples of pairs $(K_0,K_1)$ of compact connected submanifolds of $\mathbb{R}^n$ such that $Λ_{K_0}$ is not Legendrian isotopic to $Λ_{K_1}$, although they cannot be distinguished by classical invariants. Here, $K_1$ is the image of an embedding $ι_f \colon K_0 \to \mathbb{R}^n$ which is regular homotopic to the inclusion map of $K_0$ and the codimension in $\mathbb{R}^n$ is greater than or equal to $4$. As non-classical invariants, we define the strip Legendrian contact homology and a coproduct on it under certain conditions on Legendrian submanifolds. Then, we give a purely topological description of these invariants for $Λ_K$ when the codimension of $K$ is greater than or equal to $4$. The main examples $Λ_{K_0}$ and $Λ_{K_1}$ are distinguished by the coproduct, which is computed by using an idea of string topology. |
| title | Legendrian non-isotopic unit conormal bundles in high dimensions |
| topic | Symplectic Geometry Geometric Topology 53D42, 57R17, 55P50 |
| url | https://arxiv.org/abs/2410.15936 |