# Transitively twisted flows of 3-manifolds

### H. Nakayama

Hiroshima University, Higashi-Hiroshima, Japan

## Abstract

A non-singular C1 vector field X of a closed 3-manifold M generating a flow $\varphi_t$ induces a flow of the bundle N X orthogonal to X. This flow further induces a flow $P \varphi_t$ of the projectivized bundle of N X. In this paper, we assume that the projectivized bundle is a trivial bundle, and study the lift $\angle\varphi_t$ of $P \varphi_t$ to the infinite cyclic covering $M \times \mathbb{R}$. We prove that the flow $\angle\varphi_t$ is not minimal, and construct an example of $\varphi_t$ such that $\angle\varphi_t$ has a dense orbit. If $\varphi_t$ is almost periodic and minimal, then $\angle\varphi_t$ is shown to be classified into three cases: (1) All the orbits of $\angle\varphi_t$ are bounded. (2) All the orbits of $\angle\varphi_t$ are proper. (3) $\angle\varphi_t$ is transitive.