Geometry of symplectic flux and Lagrangian torus fibrations

TL;DR

This paper introduces a new numerical invariant derived from Fukaya algebra to analyze symplectic flux and Lagrangian fibrations, providing geometric constraints and classifications in symplectic topology.

Contribution

It defines a novel invariant for Lagrangian submanifolds using Fukaya algebra, revealing concavity properties and deriving geometric constraints on flux and embeddings.

Findings

Invariant exhibits concavity over isotopies with linear flux

Constraints on flux and embeddings for Gelfand-Cetlin fibres

Classification of almost toric fibrations on the complex projective plane

Abstract

Symplectic flux measures the areas of cylinders swept in the process of a Lagrangian isotopy. We study flux via a numerical invariant of a Lagrangian submanifold that we define using its Fukaya algebra. The main geometric feature of the invariant is its concavity over isotopies with linear flux. We derive constraints on flux, Weinstein neighbourhood embeddings and holomorphic disk potentials for Gelfand-Cetlin fibres of Fano varieties in terms of their polytopes. We also describe the space of fibres of almost toric fibrations on the complex projective plane up to Hamiltonian isotopy, and provide other applications.