Superintegrable geodesic flows on the hyperbolic plane

TL;DR

This paper investigates superintegrable geodesic flows on the hyperbolic plane, extending previous work to include hyperbolic dependence of integrals, and provides conditions for their existence on the hyperbolic plane.

Contribution

It solves the case of hyperbolic dependence of extra integrals in superintegrable geodesic flows, expanding the understanding of integrability on hyperbolic surfaces.

Findings

Extra integrals can have hyperbolic dependence in superintegrable flows.

The resulting flows are not defined on the two-sphere.

Conditions are provided for flows to be defined on the hyperbolic plane.

Abstract

In the framework laid down by Matveev and Shevchishin, superintegrability is achieved with one integral linear in the momenta (a Killing vector) and two extra integrals of of any degree above two in the momenta. However these extra integrals may exhibit either a trigonometric dependence in the Killing coordinate (a case we have already solved) or a hyperbolic dependence and this case is solved here. Unfortunately the resulting geodesic flow is {\em never} defined on the two-sphere, as was the case for Koenigs systems (with quadratic extra integrals). Nevertheless we give some sufficient conditions under which the geodesic flow is defined on the hyperbolic plane.