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arXiv · 2609.06821

Mirror Counts of Spectral Curves

Tom Graber·Mingyuan Hu·Eric Zaslow
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Abstract

Given a convex lattice polygon $Δ\subset \mathbb R^2$, let $N_Δ$ be the count of rational, nodal curves in the linear system of the ample line bundle $L_Δ$ on the toric variety $\mathbb P_Δ$ defined by $Δ$, having fixed intersection with the toric boundary. We show that the relative Jacobian of the linear system defines an integrable system that has a mirror dual in the language of constructible sheaves on a two-torus microsupported on a Legendrian link. In this setting, we define the dual counting problem using an analogue of rulings of Legendrian links in three-space, then prove equivalence with $N_Δ$. We perform calculations of $N_Δ$ in several examples using constructible methods, tropical curve counting, and localization in logarithmic Gromov-Witten theory to demonstrate the equality of the different approaches. Moreover, the rulings give rise to a stratification of the moduli of constructible sheaves. We conjecture that this ruling decomposition recovers the refined tropical invariants of Block-Göttsche, and hence encodes higher-genus logarithmic Gromov--Witten invariants, by a theorem of Bousseau.

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Tom Graber, Mingyuan Hu, Eric Zaslow. 2026-09-06. Mirror Counts of Spectral Curves. https://arxiv.org/abs/2609.06821

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