Exceptional groups and del Pezzo surfaces

Details Exceptional groups and del Pezzo surfaces Exceptional groups and del Pezzo surfaces

2000-09-15

arxiv.org/abs/math/0009155v2

Mathematics

Algebraic Geometry

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Scientific paper

Given a del Pezzo surface of degree d between 1 and 6, possibly with rational double points, we construct a "tautological" holomorphic G-bundle over X, where G is a reductive group which is an appropriate conformal form of the simply connected complex linear group whose coroot lattice is isomorphic to the primitive cohomology of the minimal resolution of X. For example, in case d=3 and X is a smooth cubic surface, the rank 27 vector bundle over X associated to the G-bundle constructed above and the standard 27-dimensional representation of E_6 is a direct sum of the line bundles associated to the 27 lines on X. We also discuss the restriction of the G-bundle to smooth hyperplane sections.

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