Poisson reduction of the space of polygons

Details Poisson reduction of the space of polygons Poisson reduction of the space of polygons

2010-07-12

arxiv.org/abs/1007.1952v1

Physics

Mathematical Physics

27 pages

Scientific paper

A family of Poisson structures, parametrised by an arbitrary odd periodic function $\phi$, is defined on the space $\cW$ of twisted polygons in $\RR^\nu$. Poisson reductions with respect to two Poisson group actions on $\cW$ are described. The $\nu=2$ and $\nu=3$ cases are discussed in detail and the general $\nu$ case in less detail. Amongst the Poisson structures arising in examples are to be found the lattice Virasoro structure, the second Toda lattice structure and some extended Toda lattice structures. A general result is proved showing that, for any $\nu$, to certain concrete choices of $\phi$ there correspond compatible Poisson structures which generate all the extended bigraded Toda hierarchies of a suitable size.

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