#### Volume 21, issue 6 (2021)

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Fibrations of $\mathbb{R}^3$ by oriented lines

### Michael Harrison

Algebraic & Geometric Topology 21 (2021) 2899–2928
##### Abstract

A continuous fibration of ${ℝ}^{3}$ by oriented lines is given by a unit vector field $V:{ℝ}^{3}\to {S}^{2}$ for which all of the integral curves are oriented lines. A line fibration is called skew if no two fibers are parallel. Skew fibrations have been the focus of recent study, in part due to their close relationships with great circle fibrations of ${S}^{3}$ and with tight contact structures on ${ℝ}^{3}$. Both geometric and topological classifications of the space of skew fibrations have appeared; these classifications rely on certain rigid geometric properties exhibited by skew fibrations. Here we study these properties for line fibrations which are not necessarily skew, and we offer some partial answers to the question: in what sense do nonskew fibrations look and behave like skew fibrations? We develop and utilize a technique, called the parallel plane pushoff, for studying nonskew fibrations. In addition, we summarize the known relationship between line fibrations and contact structures, and we extend these results to give a complete correspondence. Finally, we develop a technique for generating nonskew fibrations and offer a number of examples. All results (except where otherwise stated) hold in the topological category.

##### Keywords
line fibration, skew fibration, great circle fibration, continuity at infinity, parallel plane pushoff, tight contact structure
##### Mathematical Subject Classification 2010
Primary: 57R22
Secondary: 53C12, 57R17