Jacobi Structures of Evolutionary Partial Differential Equations

Details Jacobi Structures of Evolutionary Partial Differential Equations Jacobi Structures of Evolutionary Partial Differential Equations

2009-10-12

arxiv.org/abs/0910.2085v1

Mathematics

Differential Geometry

59 pages

Scientific paper

In this paper we introduce the notion of infinite dimensional Jacobi structure to describe the geometrical structure of a class of nonlocal Hamiltonian systems which appear naturally when applying reciprocal transformations to Hamiltonian evolutionary PDEs. We prove that our class of infinite dimensional Jacobi structures is invariant under reciprocal transformations. The main technical tool is in a suitable generalization of the classical Schouten-Nijenhuis bracket to the space of the so called quasi-local multi-vectors, and a simple realization of this structure in the framework of supermanifolds. These constructions are used to the computation of the Lichnerowicz-Jacobi cohomologies of Jacobi structures. We also introduce the notion of bi-Jacobi structures and consider the integrability of a system of evolutionary PDEs that possesses a bi-Jacobi structure.

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