The Atiyah--Hitchin bracket and the open Toda lattice

Details The Atiyah--Hitchin bracket and the open Toda lattice The Atiyah--Hitchin bracket and the open Toda lattice

2002-02-28

arxiv.org/abs/math-ph/0202047v1

Jour. Geometry and Physics 46 (2003) 283-307

Physics

Mathematical Physics

26 pages, 2 figures

Scientific paper

10.1016/S0393-0440(02)00135-3

The dynamics of finite nonperiodic Toda lattice is an isospectral deformation of the finite three--diagonal Jacobi matrix. It is known since the work of Stieltjes that such matrices are in one--to--one correspondence with their Weyl functions. These are rational functions mapping the upper half--plane into itself. We consider representations of the Weyl functions as a quotient of two polynomials and exponential representation. We establish a connection between these representations and recently developed algebraic--geometrical approach to the inverse problem for Jacobi matrix. The space of rational functions has natural Poisson structure discovered by Atiyah and Hitchin. We show that an invariance of the AH structure under linear--fractional transformations leads to two systems of canonical coordinates and two families of commuting Hamiltonians. We establish a relation of one of these systems with Jacobi elliptic coordinates.

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