Polyfold Regularization of Constrained Moduli Spaces

TL;DR

This paper develops a framework for regularizing constrained moduli spaces using tame sc-Fredholm sections and slices in polyfold theory, with applications to symplectic geometry and Gromov-Witten invariants.

Contribution

It introduces tame sc-Fredholm sections and slices, and proves their properties and applications in regularizing moduli spaces with constraints.

Findings

Slices have finite codimension and are compatible with sc-Fredholm sections.

Restricted sections on slices have reduced Fredholm index.

Applications include fiber products and avoiding sphere bubbles in moduli spaces.

Abstract

We introduce tame sc-Fredholm sections and slices of sc-Fredholm sections. A slice is a notion of subpolyfold that is compatible with the sc-Fredholm section and has finite locally constant codimension. We prove that the subspace of a tame polyfold that satisfies a transverse sc-smooth constraint in a finite dimensional smooth manifold is a slice of any tame sc-Fredholm section compatible with the constraint. Moreover, we prove that a sc-Fredholm section restricted to a slice is a tame sc-Fredholm section with a drop in Fredholm index given by the codimension of the slice. As a corollary, we obtain fiber products of tame sc-Fredholm sections. We describe applications to Gromov-Witten invariants, constructing the Piunikhin-Salamon-Schwarz maps for general closed symplectic manifolds, and avoiding sphere bubbles in moduli spaces of expected dimension $0$ and $1$.