Authors: Andre Chatzistamatiou
Publish Date: 2011/12/29
Volume: 354, Issue: 3, Pages: 1177-1200
Abstract
For a proper not necessarily smooth variety over a finite field with q elements Berthelot–Bloch–Esnault proved a trace formula which computes the number of rational points modulo q in terms of the Witt vector cohomology We show the analogous formula for Witt vector cohomology of finite length In addition we prove a vanishing result for the compactly supported étale cohomology of a constant ptorsion sheaf on an affine Cohen–Macaulay variety
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