Remarks on Joachimsthal integral and Poritsky property
Differential Geometry
2020-09-11 v1
Abstract
The billiard in an ellipse has an integral linear in momentum, the Joachimsthal integral. We show that the existence of such an integral characterizes conics. We extend this result to the spherical and hyperbolic geometries and to higher dimensions. We connect the existence of Joachimsthal integral with the Poritsky property, a property of billiard curves, called so after H. Poritsky whose important 1950 paper was one of the early studies of the billiard problem.
Keywords
Cite
@article{arxiv.2009.04988,
title = {Remarks on Joachimsthal integral and Poritsky property},
author = {Maxim Arnold and Serge Tabachnikov},
journal= {arXiv preprint arXiv:2009.04988},
year = {2020}
}