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2013
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# Hervé Sabourin

86962 Futuroscope Chasseneuil Cedex, France
Laboratoire de Mathématiques, UMR 7348 du CNRS, Université de Poitiers

## Publications:

 Damianou P. A., Sabourin H., Vanhaecke P. Intermediate Toda Systems 2015, vol. 20, no. 3, pp.  277-292 Abstract We construct a large family of Hamiltonian systems which interpolate between the classical Kostant–Toda lattice and the full Kostant–Toda lattice and we discuss their integrability. There is one such system for every nilpotent ideal $\mathcal{I}$ in a Borel subalgebra $\mathfrak{b}_+$ of an arbitrary simple Lie algebra $\mathfrak{g}$. The classical Kostant–Toda lattice corresponds to the case of $\mathcal{I}=[\mathfrak{n}_+, \mathfrak{n}_+]$, where $\mathfrak{n}_+$ is the unipotent ideal of $\mathfrak{b}_+$, while the full Kostant–Toda lattice corresponds to $\mathcal{I}=\{0\}$. We mainly focus on the case $\mathcal{I}=[[\mathfrak{n}_+, \mathfrak{n}_+], \mathfrak{n}_+]$. In this case, using the theory of root systems of simple Lie algebras, we compute the rank of the underlying Poisson manifolds and construct a set of (rational) functions in involution, large enough to ensure Liouville integrability. These functions are restrictions of well-chosen integrals of the full Kostant–Toda lattice, except for the case of the Lie algebras of type $C$ and $D$ where a different function (Casimir) is needed. The latter fact, and other ones listed in the paper, point at the Liouville integrability of all the systems we construct, but also at the nontriviality of obtaining the result in full generality. Keywords: Toda lattices, integrable systems Citation: Damianou P. A., Sabourin H., Vanhaecke P.,  Intermediate Toda Systems, Regular and Chaotic Dynamics, 2015, vol. 20, no. 3, pp. 277-292 DOI:10.1134/S1560354715030053