Highly Irregular Quantum Constraints

Details Highly Irregular Quantum Constraints Highly Irregular Quantum Constraints

2006-02-27

arxiv.org/abs/gr-qc/0602114v1

Class.Quant.Grav. 23 (2006) 3641

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

19 pages, latex

Scientific paper

10.1088/0264-9381/23/10/025

Motivated by a recent paper of Louko and Molgado, we consider a simple system with a single classical constraint R(q)=0. If q_l denotes a generic solution to R(q)=0, our examples include cases where R'(q_l)\ne 0 (regular constraint) and R'(q_l)=0 (irregular constraint) of varying order as well as the case where R(q)=0 for an interval, such as a \leq q \leq b. Quantization of irregular constraints is normally not considered; however, using the projection operator formalism we provide a satisfactory quantization which reduces to the constrained classical system when \hbar \to 0. It is noteworthy that irregular constraints change the observable aspects of a theory as compared to strictly regular constraints.

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