Discrete dynamical systems associated with the configuration space of 8 points in P^3(C)

Details Discrete dynamical systems associated with the configuration space of 8 points in P^3(C) Discrete dynamical systems associated with the configuration space of 8 points in P^3(C)

2003-03-09

arxiv.org/abs/nlin/0303019v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

23 pages

Scientific paper

10.1007/s00220-004-1043-5

A 3 dimensional analogue of Sakai's theory concerning the relation between rational surfaces and discrete Painlev\'e equations is studied. For a family of rational varieties obtained by blow-ups at 8 points in general position in ${\mathbb P}^3$, we define its symmetry group using the inner product that is associated with the intersection numbers and show that the group is isomorphic to the Weyl group of type $E_7^{(1)}$. By normalizing the configuration space by means of elliptic curves, the action of the Weyl group and the dynamical system associated with a translation are explicitly described. As a result, it is found that the action of the Weyl group on ${\mathbb P}^3$ preserves a one parameter family of quadratic surfaces and that it can therefore be reduced to the action on ${\mathbb P}^1\times {\mathbb P}^1$.

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