The Calabi complex and Killing sheaf cohomology

It has recently been noticed that the degeneracies of the Poisson bracket of linearized grav-ity on constant curvature Lorentzian manifold can be described in terms of the cohomolo-gies of a certain complex of differential operators. This complex was first introduced by Calabi and its cohomology is known to be isomorphic to that of the (locally constant) sheaf of Killing vectors. We review the structure of the Calabi complex in a novel way, with ex-plicit calculations based on representation theory of GL(n), and also some tools for studying its cohomology in terms of locally constant sheaves. We also conjecture how these tools would adapt to linearized gravity on other backgrounds and to other gauge theories. The presentation includes explicit formulas for the differential operators in the Calabi complex, arguments for its local exactness, discussion of generalized Poincare duality, methods of computing the cohomology of locally constant sheaves, and example calculations of Killing sheaf cohomologies of some black hole and cosmological Lorentzian manifolds. (C) 2016 Elsevier B.V. All rights reserved.