Qregularity and an Extension of Evans-Griffiths Criterion to Vector Bundles on Quadrics

Ballico, Edoardo; Malaspina, Francesco

Qregularity and an Extension of Evans-Griffiths Criterion to Vector Bundles on Quadrics

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Description

Here we define the concept of Qregularity for coherent sheaves on quadrics. In this setting we prove analogs of some classical properties. We compare the Qregularity of coherent sheaves on $\Q_n\subset \mathbb P^{n+1}$ with the Castelnuovo-Mumford regularity of their extension by zero in $\mathbb P^{n+1}$. We also classify the coherent sheaves with Qregularity $-\infty$. We use our notion of Qregularity in order to prove an extension of Evans-Griffiths criterion to vector bundles on Quadrics. In particular we get a new and simple proof of the Knörrer's characterization of ACM bundles.
13 pages, no figures