Slodowy slices and the complete integrability of Mishchenko-Fomenko subalgebras on regular adjoint orbits

Abstract

This work is concerned with Mishchenko-Fomenko subalgebras and their restrictions to the adjoint orbits in a finite-dimensional complex semisimple Lie algebra. In this setting, it is known that each Mishchenko-Fomenko subalgebra restricts to a completely integrable system on every orbit in general position. We improve upon this result, showing that each Mishchenko-Fomenko subalgebra yields a completely integrable system on all regular orbits (i.e. orbits of maximal dimension). Our approach incorporates the theory of regular ${\mathfrak{sl}}_2$-triples and associated Slodowy slices, as developed by Kostant.