Riemann-Roch Theorems for Deligne-Mumford Stacks

Details Riemann-Roch Theorems for Deligne-Mumford Stacks Riemann-Roch Theorems for Deligne-Mumford Stacks

1998-03-17

arxiv.org/abs/math/9803076v2

Mathematics

Algebraic Geometry

French, 47 pages, accents correction

Scientific paper

The goal of this paper is to prove Riemann-Roch type theorems for Deligne-Mumford algebraic stacks. To this end, we introduce a "cohomology with coefficients in representations" and a Chern character, and we prove a Grothendieck-Riemann-Roch theorem for the Riemann-Roch transformation it defines. As a corollary we obtain an Hirzebruch-Riemann-Roch formula for the Euler characteristic of a coherent sheaf, and some formulas for the different topological Euler characteristics of complex algebraic stacks.

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