Title

Purity and decomposition theorems for staggered sheaves

Document Type

Article

Publication Date

10-1-2012

Abstract

Two major results in the theory of ℓ-adic mixed constructible sheaves are the purity theorem (every simple perverse sheaf is pure) and the decomposition theorem (every pure object in the derived category is a direct sum of shifts of simple perverse sheaves). In this paper, we prove analogues of these results for coherent sheaves. Specifically, we work with staggered sheaves, which form the heart of a certain t-structure on the derived category of equivariant coherent sheaves. We prove, under some reasonable hypotheses, that every simple staggered sheaf is pure, and that every pure complex of coherent sheaves is a direct sum of shifts of simple staggered sheaves. © Copyright 2012 Cambridge University Press.

Publication Source (Journal or Book title)

Journal of the Institute of Mathematics of Jussieu

First Page

695

Last Page

745

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