The generalized Euler-Poinsot rigid body equations: explicit elliptic solutions

TL;DR

This paper derives explicit elliptic solutions for generalized Euler-Poinsot rigid body equations, extending classical integrable cases by analyzing modified Poisson equations with polynomial first integrals.

Contribution

It introduces a new class of integrable generalizations of the Euler-Poinsot equations and explicitly solves the modified Poisson equations using elliptic functions.

Findings

Solutions are single-valued and expressed via sigma functions.

Explicit solutions are derived for the generalized equations.

Numerical example illustrating the solutions is provided.

Abstract

The classical Euler--Poinsot case of the rigid body dynamics admits a class of simple but non-trivial integrable generalizations, which modify the Poisson equations describing the motion of the body in space. These generalizations possess first integrals which are polynomial in the angular momenta. We consider the modified Poisson equations as a system of linear equations with elliptic coefficients and show that all the solutions of it are single-valued. By using the vector generalization of the Picard theorem, we derive the solutions explicitly in terms of sigma functions of the corresponding elliptic curve. The solutions are accompanied with a numerical example. We also compare the generalized Poisson equations with % some generalizations of the classical 3rd order Halphen equation.