Lagrangian Surplusection Phenomena

Suppose you have a family of Lagrangian submanifolds $L_t$ and an auxiliary Lagrangian $K$. Suppose that $K$ intersects some of the $L_t$ more than the minimal number of times. Can you eliminate surplus intersection (surplusection) with all fibres by performing a Hamiltonian isotopy of $K$? Or will any Lagrangian isotopic to $K$ surplusect some of the fibres? We argue that in several important situations, surplusection cannot be eliminated, and that a better understanding of surplusection phenomena (better bounds and a clearer understanding of how the surplusection is distributed in the family) would help to tackle some outstanding problems in different areas, including Oh's conjecture on the volume-minimising property of the Clifford torus and the concurrent normals conjecture in convex geometry. We pose many open questions.

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Publication Details

Journal
Symmetry Integrability and Geometry Methods and Applications
Published
2024-12-06
DOI
https://doi.org/10.3842/sigma.2024.109
Primary Topic
Geometric and Algebraic Topology
Type
article
Field-Weighted Citation Impact
0.00

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article

Lagrangian Surplusection Phenomena

Georgios Dimitroglou Rizell, J. D. Evans
Symmetry Integrability and Geometry Methods and Applications
Geometric and Algebraic Topology
article

Lagrangian Surplusection Phenomena

Georgios Dimitroglou Rizell, J. D. Evans
article en

Abstract

Suppose you have a family of Lagrangian submanifolds $L_t$ and an auxiliary Lagrangian $K$. Suppose that $K$ intersects some of the $L_t$ more than the minimal number of times. Can you eliminate surplus intersection (surplusection) with all fibres by performing a Hamiltonian isotopy of $K$? Or will any Lagrangian isotopic to $K$ surplusect some of the fibres? We argue that in several important situations, surplusection cannot be eliminated, and that a better understanding of surplusection phenomena (better bounds and a clearer understanding of how the surplusection is distributed in the family) would help to tackle some outstanding problems in different areas, including Oh's conjecture on the volume-minimising property of the Clifford torus and the concurrent normals conjecture in convex geometry. We pose many open questions.

Symmetry Integrability and Geometry Methods and Applications
Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet, Engineering and Physical Sciences Research Council
Reduced inequalities
Openalex Percentile: Top 65%
Geometric and Algebraic Topology
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Lagrangian Surplusection Phenomena — Georgios Dimitroglou Rizell, J. D. Evans · Symmetry Integrability and Geometry Methods and Applications (2024) | TGRS Research Map | TGRS