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Small energy isotopies of loose Legendrian submanifolds

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arxiv 2105.05970 v3 pith:Z3OI5CW2 submitted 2021-05-12 math.SG

classification math.SG
keywords legendrianlooseenergychartisotopysizeapproximatedarbitrarily
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abstract

We prove that for a closed Legendrian submanifold $L$ of dimension $n \geq 2$ with a loose chart of size $\eta$, any Legendrian isotopy starting at $L$ can be $C^0$-approximated by a Legendrian isotopy with energy arbitrarily close to $\frac{\eta}{2}$. This in particular implies that the displacement energy of loose displaceable Legendrians is bounded by half the size of its smallest loose chart, which proves a conjecture of Dimitroglou Rizell and Sullivan.

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  1. Non-orderability and the contact Hofer norm

    math.SG 2024-11 conditional novelty 8.0 of 10

    Contact Hofer norm bounds, obtained from open books and loose Legendrians, imply non-orderability and resolve the standard S^1 × S^2 case.

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