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Towers of Looijenga pairs and asymptotics of ECH capacities

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Abstract

ECH capacities are rich obstructions to symplectic embeddings in 4-dimensions that have also been seen to arise in the context of algebraic positivity for (possibly singular) projective surfaces. We extend this connection to relate general convex toric domains on the symplectic side with towers of polarised toric surfaces on the algebraic side, and then use this perspective to show that the sub-leading asymptotics of ECH capacities for all convex and concave toric domains are O(1). We obtain sufficient criteria for when the sub-leading asymptotics converge in this context, generalising results of Hutchings and of the author, and derive new obstructions to embeddings between toric domains of the same volume. We also propose two invariants to more precisely describe when convergence occurs in the toric case. Our methods are largely non-toric in nature, and apply more widely to towers of polarised Looijenga pairs.

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Notes

  1. Hutchings’ result also shows that Conj. 1(ii) is true when \(\Omega \) is ‘strictly concave’.

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Acknowledgements

I am grateful for many encouraging and helpful conversation with Dan Cristofaro-Gardiner, Michael Hutchings, Julian Chaidez, Vinicius Ramos, Tara Holm, and Ana Rita Pires. I am especially grateful to Michael Hutchings for discussing the content of [15] with me, and to Vinicius Ramos for hosting me at IMPA where the idea for this project was seeded. I am very thankful to Ɖan-Daniel Erdmann-Pham for providing the proof of Lemma 3.8. No data repositories were used in this research.

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  1. Washington University in St. Louis, St. Louis, MO, USA

    Ben Wormleighton

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Correspondence to Ben Wormleighton.

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Wormleighton, B. Towers of Looijenga pairs and asymptotics of ECH capacities. manuscripta math. 172, 499–530 (2023). https://doi.org/10.1007/s00229-022-01421-y

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