# Contact structures induced by skew fibrations of R^3

## TL;DR

This paper demonstrates that nondegenerate skew fibrations of R^3 induce tight contact structures, revealing deep connections between geometric fibrations and contact topology.

## Contribution

It establishes that the plane fields from nondegenerate fibrations are tight contact structures, providing a new characterization and linking fibrations to contact topology.

## Key findings

- Plane fields from nondegenerate fibrations are tight contact structures.
- A new characterization of nondegenerate fibrations is introduced.
- Examples illustrate relationships among fibrations and contact structures.

## Abstract

A smooth fibration of $\mathbb{R}^3$ by oriented lines is given by a smooth unit vector field $V$ on $\mathbb{R}^3$, for which all of the integral curves are oriented lines. Such a fibration is called skew if no two fibers are parallel, and it is called nondegenerate if $\nabla V$ vanishes only in the direction of $V$. Nondegeneracy is a form of local skewness, though in fact any nondegenerate fibration is globally skew. Nondegenerate and skew fibrations have each been recently studied, from both geometric and topological perspectives, in part due to their close relationship with great circle fibrations of $S^3$. Any fibration of $\mathbb{R}^3$ by oriented lines induces a plane field on $\mathbb{R}^3$, obtained by taking the orthogonal plane to the unique line through each point. We show that the plane field induced by any nondegenerate fibration is a tight contact structure. For contactness we require a new characterization of nondegenerate fibrations, whereas the proof of tightness employs a recent result of Etnyre, Komendarczyk, and Massot on tightness in contact metric 3-manifolds. We conclude with some examples which highlight relationships among great circle fibrations, nondegenerate fibrations, skew fibrations, and the contact structures associated to fibrations.