Quasilocal Energy for Spin-net Gravity

Details Quasilocal Energy for Spin-net Gravity Quasilocal Energy for Spin-net Gravity

1999-06-15

arxiv.org/abs/gr-qc/9906052v2

Class.Quant.Grav. 17 (2000) 1467-1487

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

24 pages, 20 figures; v2 significant changes: section 3.2 expanded, section 3.4 rewritten, discussion of edge orientation revi

Scientific paper

10.1088/0264-9381/17/6/311

The Hamiltonian of a gravitational system defined in a region with boundary is quantized. The classical Hamiltonian, and starting point for the regularization, is required by functional differentiablity of the Hamiltonian constraint. The boundary term is the quasilocal energy of the system and becomes the ADM mass in asymptopia. The quantization is carried out within the framework of canonical quantization using spin networks. The result is a gauge invariant, well-defined operator on the Hilbert space induced from the state space on the whole spatial manifold. The spectrum is computed. An alternate form of the operator, with the correct naive classical limit, but requiring a restriction on the Hilbert space, is also defined. Comparison with earlier work and several consequences are briefly explored.

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