Dualizing Complexes and Perverse Modules over Differential Algebras

Details Dualizing Complexes and Perverse Modules over Differential Algebras Dualizing Complexes and Perverse Modules over Differential Algebras

2003-01-28

arxiv.org/abs/math/0301323v3

Mathematics

Rings and Algebras

38 pages; minor changes; final version, to appear in Compositio Math

Scientific paper

A differential algebra of finite type over a field k is a filtered algebra A, such that the associated graded algebra is finite over its center, and the center is a finitely generated k-algebra. The prototypical example is the algebra of differential operators on a smooth affine variety, when char k = 0. We study homological and geometric properties of differential algebras of finite type. The main results concern the rigid dualizing complex over such an algebra A: its existence, structure and variance properties. We also define and study perverse A-modules, and show how they are related to the Auslander property of the rigid dualizing complex of A.

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