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ЖУРНАЛЫ // Symmetry, Integrability and Geometry: Methods and Applications // Архив

SIGMA, 2024, том 20, 109, 13 стр. (Mi sigma2111)

Lagrangian Surplusection Phenomena

Georgios Dimitroglou Rizella, Jonathan David Evansb

a Department of Mathematics, Uppsala Universitet, Uppsala, Sweden
b Department of Mathematics and Statistics, Lancaster University, Bailrigg, UK

Аннотация: 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.

Ключевые слова: symplectic geometry, Lagrangian intersections, Floer theory.

MSC: 53D12, 53D40

Поступила: 3 сентября 2024 г.; в окончательном варианте 23 ноября 2024 г.; опубликована 6 декабря 2024 г.

Язык публикации: английский

DOI: 10.3842/SIGMA.2024.109


ArXiv: 2408.14883


© МИАН, 2025