Time in (2+1)-Dimensional Quantum Gravity
Abstract
General relativity in three spacetime dimensions is used to explore three approaches to the ``problem of time'' in quantum gravity: the internal Schr\"odinger approach with mean extrinsic curvature as a time variable, the Wheeler-DeWitt equation, and covariant canonical quantization with ``evolving constants of motion.'' (To appear in Proc.\ of the Lanczos Centenary Conference, Raleigh, NC, December 1993.)
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