Physics – High Energy Physics – High Energy Physics - Theory

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1992-01-24

Commun.Math.Phys. 152 (1993) 167-190

Physics

High Energy Physics

High Energy Physics - Theory

29 pages

Scientific paper

10.1007/BF02097062

The canonical structure of classical non-linear sigma models on Riemannian symmetric spaces, which constitute the most general class of classical non-linear sigma models known to be integrable, is shown to be governed by a fundamental Poisson bracket relation that fits into the $r$-$s$-matrix formalism for non-ultralocal integrable models first discussed by Maillet. The matrices $r$ and $s$ are computed explicitly and, being field dependent, satisfy fundamental Poisson bracket relations of their own, which can be expressed in terms of a new numerical matrix~$c$. It is proposed that all these Poisson brackets taken together are representation conditions for a new kind of algebra which, for this class of models, replaces the classical Yang-Baxter algebra governing the canonical structure of ultralocal models. The Poisson brackets for the transition matrices are also computed, and the notorious regularization problem associated with the definition of the Poisson brackets for the monodromy matrices is discussed.

**Bordemann Martin**

Physics – Mathematical Physics

Scientist

**Forger Michael**

Mathematics – Operator Algebras

Scientist

**Laartz J.**

Physics – High Energy Physics – High Energy Physics - Theory

Scientist

**Schaeper U.**

Physics – High Energy Physics – High Energy Physics - Theory

Scientist

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