Generating the Fukaya categories of compact toric varieties

TL;DR

This paper explicitly constructs objects in the Fukaya category of compact toric varieties, demonstrating how the Kodaira-Spencer isomorphism factors through the closed-open map and establishing split-generation of certain summands.

Contribution

It provides an explicit construction linking the Kodaira-Spencer isomorphism to the closed-open map, proving split-generation of Fukaya category summands for compact toric varieties.

Findings

The Hochschild cohomology injects into the Fukaya category.

Explicit objects are constructed for each summand.

Split-generation of Fukaya categories is established.

Abstract

Let $X$ be a compact toric variety. The quantum cohomology of $X$ decomposes as a direct sum, and associated to each summand $Q$ is a toric fibre $L_Q$ with rank $1$ local system. By building an explicit twisted-complex-like object, we show that on $Q$ the Kodaira-Spencer isomorphism of Fukaya-Oh-Ohta-Ono factors through the closed-open string map to the Hochschild cohomology of $L_Q$. We deduce that the latter is injective and hence, assuming an appropriate version of Abouzaid's criterion, that $L_Q$ split generates the corresponding summand of the Fukaya category.