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On the Additional Symmetry; Many-Body Problem Related to the KP Hierarchy

Kazuhiro Hikami, Miki Wadati

hep-tharXiv:hep-th/9402026

Abstract

Nonlinear integrable equations, such as the KdV equation, the Boussinesq equation and the KP equation, have the close relation with many-body problem. The solutions of such equations are the same as the restricted flows of the classical Calogero model, which is one-dimensional particle system with inverse square interactions. The KP hierarchy and the Calogero model share the same structure called ``additional symmetry''. This symmetry plays a crucial role in this relation.

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