Every cusp singularity link admits infinitely many strong symplectic fillings

Naohiko Kasuya; Takahiro Oba

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arXiv · 2607.01991

Every cusp singularity link admits infinitely many strong symplectic fillings

Naohiko Kasuya·Takahiro Oba

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Abstract

In this paper, we show that if the link of an isolated complex surface singularity is either a $Sol^3$-manifold or an $\widetilde{SL}(2;\mathbb{R})$-manifold with its canonical contact structure, then it admits infinitely many strong symplectic fillings that are pairwise non-diffeomorphic and not related by a sequence of blow-ups or blow-downs. As a consequence, the link of any cusp singularity, exceptional unimodal singularity, or hyperbolic Brieskorn singularity admits infinitely many pairwise non-diffeomorphic minimal strong symplectic fillings.

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Naohiko Kasuya, Takahiro Oba. 2026-07-02. Every cusp singularity link admits infinitely many strong symplectic fillings. https://arxiv.org/abs/2607.01991

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