Consistent Evolution with Different Time-Slicings in Quantum Gravity

Details Consistent Evolution with Different Time-Slicings in Quantum Gravity Consistent Evolution with Different Time-Slicings in Quantum Gravity

1995-11-22

arxiv.org/abs/gr-qc/9511059v2

Class.Quant.Grav. 13 (1996) 891-920

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Figures added (LaTeX source code), one reference updated, to appear in Class. Quant. Grav., no other changes

Scientific paper

10.1088/0264-9381/13/5/011

Rovelli's `` quantum mechanics without time'' motivates an intrinsically time-slicing independent picture of reduced phase space quantum gravity, which may be described as ``quantization after evolution''. Sufficient criteria for carrying out quantization after evolution are developed in terms of a general concept of the classical limit of quantum mechanics. If these criteria are satisfied then it is possible to have consistent unitary evolution of operators, with respect to an infinite parameter family of time-slicings (and probably all time-slicings), with the correct classical limit. The criteria are particularly amenable to study in (2+1)-dimensional gravity, where the reduced phase space is finite dimensional.

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