Pairings in mirror symmetry between a symplectic manifold and a Landau-Ginzburg $B$-model

Abstract

We find a relation between Lagrangian Floer pairing of a symplectic manifold and Kapustin-Li pairing of the mirror Landau-Ginzburg model under localized mirror functor. They are conformally equivalent with an interesting conformal factor $(vo{l}^{Floer}/vol{)}^2$, which can be described as a ratio of Lagrangian Floer volume class and classical volume class. For this purpose, we introduce $B$-invariant of Lagrangian Floer cohomology with values in Jacobian ring of the mirror potential function. And we prove what we call a multi-crescent Cardy identity under certain conditions, which is a generalized form of Cardy identity. As an application, we discuss the case of general toric manifold, and the relation to the work of Fukaya-Oh-Ohta-Ono and their $Z$-invariant. Also, we compute the conformal factor $(vo{l}^{Floer}/vol{)}^2$ for the elliptic curve quotient ${\mathbb{P}}_{3,3,3}^1$, which is expected to be related to the choice of a primitive form.

35 pages, 5 figures. Comments are welcome