Beschreibung
BRST Quantization of Constrained Hamiltonian Systems : the example of asymptotically flat gravity
Abstract: The BRST Quantization of Constrained Hamiltonian Systems is reviewed in the explicit case of gravity. The BRST reformulation of the Wheeler-DeWitt equation is discussed. Two specific questions are explicitly analyzed : (i) how to compute physical amplitudes between physical states ; (ii) how asymptotic symmetries appear in the BRST context (with special emphasis on the BMS group).