Algebraic planar torsion in contact manifolds

TL;DR

This paper explores algebraic planar torsion in contact manifolds, demonstrating how symplectic field theory properties produce new examples and confirming conjectures about fillability and torsion in higher dimensions.

Contribution

It introduces a unified approach to algebraic torsion computations, constructs new examples with specific torsion properties, and confirms conjectures regarding fillability and torsion in high-dimensional contact manifolds.

Findings

Finite algebraic torsion can be derived from simple examples using symplectic field theory.

Constructed examples of contact structures with prescribed torsion in all dimensions ≥ 5.

Demonstrated that tight, non-weakly fillable contact structures are common in higher dimensions.

Abstract

We demonstrate that the functorial properties of the symplectic field theory under strong cobordisms and surgery cobordisms can produce finite algebraic (planar) torsions from simple examples, which gives a unified treatment of most of the known computations of algebraic (planar) torsions. In addition, we obtain many families of new examples, notably including (1) stably fillable examples in all dimensions $\ge 5$ with algebraic (planar) torsion precisely $k$ for any given $k\in \mathbb{N}_+$, confirming a conjecture of Latschev and Wendl; (2) contact structures on spheres of all dimensions at least $5$ with finite algebraic planar torsion at least $1$, which implies that tight not weakly fillable contact structures are ubiquitous in higher dimensions. We also explain that all known examples of contact manifolds without strong/weak fillings in dimension $\ge 5$ have algebraic planar torsion.