BRST-invariant extensions of the BMS generators are constructed and used to define matrix elements between Wheeler-DeWitt states.
Superspace and the Nature of Quantum Geometrody- namics,
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Wheeler-DeWitt equation and Bondi-Metzner-Sachs (BMS) symmetry
BRST-invariant extensions of the BMS generators are constructed and used to define matrix elements between Wheeler-DeWitt states.