Adjoint representation of E_8 and del Pezzo surfaces of degree 1

Details Adjoint representation of E_8 and del Pezzo surfaces of degree 1 Adjoint representation of E_8 and del Pezzo surfaces of degree 1

2010-05-07

arxiv.org/abs/1005.1272v1

Mathematics

Algebraic Geometry

21 pages

Scientific paper

Let X be a del Pezzo surface of degree 1, and let G be the simple Lie group of type E_8. We construct a locally closed embedding of a universal torsor over X into the G-orbit of the highest weight vector of the adjoint representation. This embedding is equivariant with respect to the action of the Neron-Severi torus T of X identified with a maximal torus of G extended by the group of scalars. The T-invariant hyperplane sections of the torsor defined by the roots of G are inverse images of the 240 exceptional curves on X. This extends the main result of our previous work to del Pezzo surfaces of degree 1.

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