Traveling along horizontal broken geodesics of a homogenous Finsler submersion

Abstract

In this paper, we discuss how to travel along horizontal broken geodesics of a homogenous Finsler submersion, i.e., we study, what in Riemannian geometry was called by Wilking, the dual leaves. More precisely, we investigate the attainable sets $\mathcal{A}_{q}(\mathcal{C})$ of the set of analytic vector fields $\mathcal{C}$ determined by the family of horizontal unit geodesic vector fields $\mathcal{C}$ to the fibers $\mathcal{F}=\{ρ^{-1}(c)\}$ of a homogenous analytic Finsler submersion $ρ: M\to B$. Since reverse of geodesics don't need to be geodesics in Finsler geometry, one can have examples on non compact Finsler manifolds $M$ where the attainable sets (the dual leaves) are no longer orbits or even submanifolds. Nevertheless we prove that, when $M$ is compact and the orbits of $\mathcal{C}$ are embedded, then the attainable sets coincide with the orbits. Furthermore, if the flag curvature is positive then $M$ coincides with the attainable set of each point. In other words, fixed two points of $M$, one can travel from one point to the other along horizontal broken geodesics. In addition, we show that each orbit $\mathcal{O}(q)$ of $\mathcal{C}$ associated to a singular Finsler foliation coincides with $M$, when the flag curvature is positive, i.e, we prove Wilking's result in Finsler context. In particular we review Wilking's transversal Jacobi fields in Finsler case.