A lower bound for the radius of Weinstein's Lagrangian tubular neighborhood

Fuente: arXiv
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Main Author: Yamamoto, Hikaru
Format: Preprint
Published: 2025
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author Yamamoto, Hikaru
author_facet Yamamoto, Hikaru
contents For an immersed Lagrangian submanifold $L$ in a Kähler manifold $(M,ω)$, there exists a symplectic local diffeomorphism from a tubular neighborhood of the image of the zero section in the normal bundle $T^{\bot}L$ of $L$, equipped with a canonical symplectic form $\tildeω$, to $(M,ω)$ whose restriction to $L$ is the identity map by Weinstein's Lagrangian tubular neighborhood theorem, where the image of the zero section in $T^{\bot}L$ is identified with $L$. In this paper, we give a lower bound for the supremum of the radii of tubular neighborhoods that have such a symplectic diffeomorphism into $(M,ω)$ from below by a constant explicitly given in terms of up to second derivatives of the Riemannian curvature tensor of $M$ and the second fundamental form of $L$. We also give a similar lower bound in the case where $L$ is compact and embedded.
format Preprint
id arxiv_https___arxiv_org_abs_2511_10973
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle A lower bound for the radius of Weinstein's Lagrangian tubular neighborhood
Yamamoto, Hikaru
Differential Geometry
Symplectic Geometry
53C42, 53D12, 53C40, 53C21
For an immersed Lagrangian submanifold $L$ in a Kähler manifold $(M,ω)$, there exists a symplectic local diffeomorphism from a tubular neighborhood of the image of the zero section in the normal bundle $T^{\bot}L$ of $L$, equipped with a canonical symplectic form $\tildeω$, to $(M,ω)$ whose restriction to $L$ is the identity map by Weinstein's Lagrangian tubular neighborhood theorem, where the image of the zero section in $T^{\bot}L$ is identified with $L$. In this paper, we give a lower bound for the supremum of the radii of tubular neighborhoods that have such a symplectic diffeomorphism into $(M,ω)$ from below by a constant explicitly given in terms of up to second derivatives of the Riemannian curvature tensor of $M$ and the second fundamental form of $L$. We also give a similar lower bound in the case where $L$ is compact and embedded.
title A lower bound for the radius of Weinstein's Lagrangian tubular neighborhood
topic Differential Geometry
Symplectic Geometry
53C42, 53D12, 53C40, 53C21
url https://arxiv.org/abs/2511.10973