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Quiver D-modules and homology of local systems over an arrangement of hyperplanes
Institute for Theoretical and Experimental Physics Moscow 117259, Russia E-mail address: khor{at}itep.ru
Department of Mathematics, University of North Carolina at Chapel Hill NC 27599-3250, USA E-mail address: anv{at}email.unc.edu
Let C be an arrangement of hyperplanes in
N, D the ring of algebraic differential operators on
N. We define a category of quivers associated with C. A quiver is a collection of vector spaces, attached to strata of the arrangement, and suitable linear maps between the spaces . To a quiver we assign a D-module on
N, called a quiver D-module. We describe basic operations for D-modules in terms of linear algebra of quivers. We give an explicit construction of a free resolution of a quiver D-module and use the construction to describe the associated perverse sheaf. As an application, we calculate the cohomology of
N with coefficients in the quiver perverse sheaf (under certain assumptions).