Kodaira-Spencer map, Lagrangian Floer theory and orbifold Jacobian algebras

TL;DR

This paper constructs a generalized Kodaira-Spencer map linking quantum cohomology and Jacobian algebras via Lagrangian Floer theory, extending to orbifold cases and providing explicit examples.

Contribution

It introduces a new construction of the Kodaira-Spencer map using $A_{}$-algebras derived from $J$-holomorphic discs, generalizing previous approaches and including orbifold cases.

Findings

Constructed a ring homomorphism from quantum cohomology to Jacobian algebra of the LG mirror.

Extended the construction to orbifold LG models with explicit computations for the 2-torus.

Established an isomorphism between the orbifold Jacobian algebra and the cohomology of a new $A_{}$-algebra.

Abstract

A version of mirror symmetry predicts a ring isomorphism between quantum cohomology of a symplectic manifold and Jacobian algebra of the Landau-Ginzburg mirror, and for toric manifolds Fukaya-Oh-Ohta-Ono constructed such a map called Kodaira-Spencer map using Lagrangian Floer theory. We discuss a general construction of Kodaira-Spencer ring homomorphism when LG mirror potential $W$ is given by $J$-holomorphic discs with boundary on a Lagrangian $L$: we find an $A_{\infty}$-algebra $\mathcal{B}$ whose $m_1$-complex is a Koszul complex for $W$ under mild assumptions on $L$. Closed-open map gives a ring homomorphism from quantum cohomology to cohomology algebra of $\mathcal{B}$ which is Jacobian algebra of $W$. We also construct an equivariant version for orbifold LG mirror $(W,H)$. We construct a Kodaira-Spencer map from quantum cohomology to another $A_{\infty}$-algebra $(\mathcal{B}\rtimes H)^H$ whose cohomology algebra is isomorphic to the orbifold Jacobian algebra of $(W,H)$ under an assumption. For the $2$-torus whose mirror is an orbifold LG model given by Fermat cubic with a $\mathbb{Z}/3$-action, we compute an explicit Kodaira-Spencer isomorphism.