On Buchsbaum bundles on quadric hypersurfaces

Details On Buchsbaum bundles on quadric hypersurfaces On Buchsbaum bundles on quadric hypersurfaces

2011-07-30

arxiv.org/abs/1108.0075v1

Mathematics

Algebraic Geometry

22 pages, no figure

Scientific paper

Let $E$ be an indecomposable rank two vector bundle on the projective space $\PP^n, n \ge 3$, over an algebraically closed field of characteristic zero. It is well known that $E$ is arithmetically Buchsbaum if and only if $n=3$ and $E$ is a null-correlation bundle. In the present paper we establish an analogous result for rank two indecomposable arithmetically Buchsbaum vector bundles on the smooth quadric hypersurface $Q_n\subset\PP^{n+1}$, $n\ge 3$. We give in fact a full classification and prove that $n$ must be at most 5. As to $k$-Buchsbaum rank two vector bundles on $Q_3$, $k\ge2$, we prove two boundedness results.

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