Lie groups. Smooth fibre bundles 3. Differential geometry of Toda-type systems.

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More about semisimple Lie algebras. Zero curvature representation of Toda-type systems. Construction of solutions and reality condition. Toda fields and generalised Plucker relations 4. Toda-type systems and their explicit solutions. General remarks. Abelian Toda systems. Nonabelian Toda systems. Higher grading systems. Notes Includes bibliographical references p.

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## SIAM Review

Public Private login e. Add a tag Cancel Be the first to add a tag for this edition. Lists What are lists? Login to add to list. Be the first to add this to a list. For a non- degenerate bi-Hamiltonian system, master symmetries can be gen- erated using a method due to W. Oevel [16]. To determine the constants of motion , one uses Flaschka's t ran sfor m at i on Quadratic Toda bracket Consider R2iV with coordinates q1; The quadratic Toda bracket appears in conjunction with isospec- tral deformations of Jacobi matrices.

First, let A be an eigenvalue of L with normalized eigenvector v. It turns out that N is the matrix of coefficients of the Poisson tensor 67 , and M, whose coefficients are quadratic functions of the a's and 6's, can be used to define a new Poisson tensor. We denote this quadratic bracket by 1t2.

The eigenvalues of L are still in involution. Furthermore, 7r2 is compatible with tti. We will generalize them later. The defining relations for 7r3 are: all other brackets are zero. The bracket 7r3 is compatible with both tti and 1t2 and the eigenvalues of L are still in involution. Construction of master symmetries In [6] a sequence of master symmetries Xr.

Before stating the theorem, we define an equivalence relation on the space of Poisson tensors.

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A bracket is trivial if Hi is a Casimir Vi. Two brackets are considered equivalent if their difference is a trivial bracket. We summarize the properties of Xn and irn in the following: 19 Theorem 6 i 7rn are all Poisson.

We give an outline of the construction of the vector fields Xn. The matrix B is now pent ad i agonal and the system of equations slightly more compli- cated. Proof: First we consider the Lie-Poisson Toda bracket.

Now we use induction on n. An easy induction general- izes this result: i. A symmetry group of a system of differential equations is a Lie group acting on the space of independent and dependent variables in such a way that solutions are mapped into other solutions. Knowing the symmetry group allows one to determine some special types of solutions invari- ant under a subgroup of the full symmetry group, and in some cases one can solve the equations completely.

The symmetry approach to solving differential equations can be found, for example, in the books of Olver [37], Bluman and Cole [38], Bluman and Kumei [39], and Ovsiannikov [40]. We look for symmetries of Toda equations, i. This is the vector field X-. The pattern suggests that X,. Theorem 7 The vector fields X,. We briefly describe the procedure. The first step is to define a second Poisson bracket on the space of canonical variables qi, We follow the notation from [15].

They reduce pre- cisely to the tensors tti and 7r2 of section III. The mapping F is a Poisson mapping between J0 and tti. The Hamiltonians h0 and hi correspond to the reduced Hamiltonians Hi and ff2 respectively. The recursion op- erator 1Z cannot be reduced. Actually, it is easy to see that there exists no recursion operator in the reduced space. The kernels of the two Poisson structures tti and 7r2 are different and, therefore, it is impossible to find an operator that maps one to the other. The deformation relations become precisely the deforma- tion relations of Theorem 6.

Of course, one has to replace j by j' — 1 in the formulas involving J?

## More non-Abelian loop Toda solitons - INSPIRE-HEP

A question we could ask, is whether every master symmetry in the reduced space comes from a recursion operator. The relativistic Toda lattice was introduced and studied by Rui- jsenaars in [22]; see also [30], [41], [42]. In terms of canonical coor- dinates the relativistic Toda lattice is defined by the Hamiltonian N H qt, The number g is a coupling constant. We follow the same technique. In the new coordinates a? All other brackets are zero. We denote this bracket by 7r2.

Note that in the case of non-relativistic Toda lattice the symplectic bracket is transformed into a linear Poisson bracket.

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Therefore we have a bi- Hamiltonian system, a situation similar to the classical case. To find higher Poisson brackets we work as in section III. The Casimir in this bracket is trL This bracket is Poisson and we still have involution of constants of motion. Another iteration, Lx2'1T4j gives a trivial bracket. In the case of the relativistic Toda equa- tions we were unable to construct a second bracket which projects onto either the linear tti or cubic 7r3 bracket and therefore we cannot implement the same procedure.

These systems correspond to Dynkin diagrams. It is well known that irreducible root systems classify simple Lie groups. So, in this generalization for each simple Lie algebra there exists a mechanical system of Toda type. The generalization is obtained from the following simple obser- vation: In terms of the natural basis qi of weights, the simple roots of. The Toda lattice corresponds to a Dynkin diagram of type.