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Author

Xuan-Chun Lu

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Preprint Sep 2026

Siebert's formula for virtual pullbacks

For a DM-type morphism of algebraic stacks $f \colon X \to Y$ with a relative perfect obstruction theory $\mathbb{E} \to \mathbb{L}_{X/Y}$ having a global resolution, we give a formula for the induced virtual pullback in terms of $\mathbb{E}$ and $f$. We apply our formula to prove functoriality properties of the virtua...

Xuan-Chun Lu, Rachel Webb · 0 citations
Preprint Sep 2026

Bulk-deformed enumerative mirror symmetry for toric Fano surfaces

We prove a version of genus-0 mirror symmetry for toric Fano surfaces at the level of big quantum cohomology. The mirror Landau-Ginzburg model $(\check{X}, W_{\infty})$ of such a surface $X$ can be defined in terms of counts of Maslov index two tropical or holomorphic discs with bulk insertions. While these mirror LG m...

Xuan-Chun Lu · 0 citations

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