Birational maps from polarization and the preservation of measure and integrals

Abstract

The main result of this paper is the discretization of second-order Hamiltonian systems of the form , where K is a constant symmetric matrix and is a polynomial of degree in any number of variables n. The discretization uses the method of polarization and preserves both the energy and the invariant measure of the differential equation, as well as the dimension of the phase space. This generalizes earlier work for discretizations of first order systems with d = 3, and of second order systems with d = 4 and n = 1.