Master Constraint Operator in Loop Quantum Gravity

Details Master Constraint Operator in Loop Quantum Gravity Master Constraint Operator in Loop Quantum Gravity

2005-10-04

arxiv.org/abs/gr-qc/0510014v4

Phys.Lett. B635 (2006) 225-231

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, significant modification in section 2, accepted for publication in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2006.03.004

We introduce a master constraint operator $\hat{\mathbf{M}}$ densely defined in the diffeomorphism invariant Hilbert space in loop quantum gravity, which corresponds classically to the master constraint in the programme. It is shown that $\hat{\mathbf{M}}$ is positive and symmetric, and hence has its Friedrichs self-adjoint extension. The same conclusion is tenable for an alternative master operator $\hat{\mathbf{M'}}$, whose quadratic form coincides with the one proposed by Thiemann. So the master constraint programme for loop quantum gravity can be carried out in principle by employing either of the two operators.

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