Elliptic constructions of hyperkaehler metrics III: Gravitons and Poncelet polygons

Details Elliptic constructions of hyperkaehler metrics III: Gravitons and Poncelet polygons Elliptic constructions of hyperkaehler metrics III: Gravitons and Poncelet polygons

2007-12-21

arxiv.org/abs/0712.3601v1

Mathematics

Differential Geometry

26 pages, 7 figures

Scientific paper

In the generalized Legendre approach, the equation describing an asymptotically locally Euclidean space of type $D_n$ is found to admit an algebraic formulation in terms of the group law on a Weierstrass cubic. This curve has the structure of a Cayley cubic for a pencil generated by two transversal plane conics, that is, it takes the form $Y^2 = \det ({\cal A}+X{\cal B})$, where ${\cal A}$ and ${\cal B}$ are the defining $3 \times 3$ matrices of the conics. In this light, the equation can be interpreted as the closure condition for an elliptic billiard trajectory tangent to the conic ${\cal B}$ and bouncing into various conics of the pencil determined by the positions of the monopoles. Poncelet's porism guarantees then that once a trajectory closes to a star polygon, any trajectory will close, regardless of the starting point and after the same number of steps.

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