On branched coverings of some homogeneous spaces

Details On branched coverings of some homogeneous spaces On branched coverings of some homogeneous spaces

1998-06-23

arxiv.org/abs/math/9806126v1

Mathematics

Algebraic Geometry

22 pages, LaTeX2e

Scientific paper

We study nonsingular branched coverings of a homogeneous space X. There is a vector bundle associated with such a covering which was conjectured by O. Debarre to be ample when the Picard number of X is one. We prove this conjecture, which implies Barth-Lefschetz type theorems, for lagrangian grassmannians, and for quadrics up to dimension six. We propose a conjectural extension to homogeneous spaces of Picard number larger than one and prove a weaker version.

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