Geometry of a pair of second-order ODEs and Euclidean spaces

Details Geometry of a pair of second-order ODEs and Euclidean spaces Geometry of a pair of second-order ODEs and Euclidean spaces

2006-10-02

arxiv.org/abs/math/0610082v1

Canad. Math. Bull. Vol. 49 (2), 2006 pp. 170-184

Mathematics

Differential Geometry

20 pages

Scientific paper

This paper investigates the relationship between a system of differential equations and the underlying geometry associated with it. The geometry of a surface determines shortest paths, or geodesics connecting nearby points, which are defined as the solutions to a pair of second-order differential equations: the Euler-Lagrange equations of the arclength action. We ask when the converse holds, that is, when solutions to a system of differential equations reveals an underlying geometry. Specifically, when may the solutions to a pair of second-order ordinary differential equations be reparameterized so as to give, locally, the geodesics of a Euclidean space? Our approach is based upon Cartan's method of equivalence. In the second part of the paper, the equivalence problem is solved for a generic pair of second-order ODEs revealing the existence of 24 invariant functions.

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