Explicit integrable systems on two dimensional manifolds with a cubic first integral

TL;DR

This paper explicitly constructs a broad family of integrable geodesic flow models on two-dimensional manifolds with a cubic first integral, expanding on prior existence proofs by providing explicit formulas.

Contribution

It introduces a coordinate choice that allows explicit integration of models previously known only through existence proofs, describing metrics with parameters on various manifolds.

Findings

Explicit local forms for integrable systems on ${\mb S}^2, {\mb H}^2, P^2({\mb R})$

Connection to known models by Goryachev, Chaplygin, Dullin, Matveev, Tsiganov

Large class of integrable geodesic flows with cubic first integrals

Abstract

A few years ago Selivanova gave an existence proof for some integrable models, in fact geodesic flows on two dimensional manifolds, with a cubic first integral. However the explicit form of these models hinged on the solution of a nonlinear third order ordinary differential equation which could not be obtained. We show that an appropriate choice of coordinates allows for integration and gives the explicit local form for the full family of integrable systems. The relevant metrics are described by a finite number of parameters and lead to a large class of models on the manifolds ${\mb S}^2, {\mb H}^2$ and $P^2({\mb R})$ containing as special cases examples due to Goryachev, Chaplygin, Dullin, Matveev and Tsiganov.