Counting embedded curves in symplectic 6-manifolds

TL;DR

This paper provides a direct proof of the invariance of embedded curve counts in symplectic 6-manifolds and confirms the Gopakumar-Vafa finiteness conjecture for certain classes, advancing understanding in symplectic geometry and enumerative invariants.

Contribution

It offers a direct proof of the invariance of embedded J-holomorphic curve counts and establishes the finiteness of these counts for large genus, confirming a key conjecture.

Findings

Proved invariance of embedded curve counts directly

Established vanishing of counts for large genus

Confirmed Gopakumar-Vafa finiteness conjecture

Abstract

Based on computations of Pandharipande, Zinger proved that the Gopakumar-Vafa BPS invariants $\mathrm{BPS}_{A,g}(X,\omega)$ for primitive Calabi-Yau classes and arbitrary Fano classes $A$ on a symplectic $6$-manifold $(X,\omega)$ agree with the signed count $n_{A,g}(X,\omega)$ of embedded $J$-holomorphic curves representing $A$ and of genus $g$ for a generic almost complex structure $J$ compatible with $\omega$. Zinger's proof of the invariance of $n_{A,g}(X,\omega)$ is indirect, as it relies on Gromov-Witten theory. In this article we give a direct proof of the invariance of $n_{A,g}(X,\omega)$. Furthermore, we prove that $n_{A,g}(X,\omega) = 0$ for $g \gg 1$, thus proving the Gopakumar-Vafa finiteness conjecture for primitive Calabi-Yau classes and arbitrary Fano classes.