Thomas-Yau conjecture and holomorphic curves

TL;DR

This paper explores the Thomas-Yau conjecture in Calabi-Yau Stein manifolds, linking semistability of Lagrangians to special Lagrangian existence through holomorphic curves, Floer theory, and variational methods.

Contribution

It clarifies the role of holomorphic curves in the conjecture, constructs bordism currents, and develops a variational framework for finding special Lagrangians.

Findings

Floer theoretic obstructions to special Lagrangians identified

Construction of bordism currents between Lagrangians

Progress in variational methods for special Lagrangian existence

Abstract

The main theme of this paper is the Thomas-Yau conjecture, primarily in the setting of exact, (quantitatively) almost calibrated, unobstructed Lagrangian branes inside Calabi-Yau Stein manifolds. In our interpretation, the conjecture is that Thomas-Yau semistability is equivalent to the existence of special Lagrangian representatives. We clarify how holomorphic curves enter this conjectural picture, through the construction of bordism currents between Lagrangians, and in the definition of the Solomon functional. Under some extra hypothesis, we shall prove Floer theoretic obstructions to the existence of special Lagrangians, using the technique of integration over moduli spaces. In the converse direction, we set up a variational framework with the goal of finding special Lagrangians under the Thomas-Yau semistability asumption, and we shall make sufficient progress to pinpoint the outstanding technical difficulties, both in Floer theory and in geometric measure theory.