In Search of Fundamental Discreteness in 2+1 Dimensional Quantum Gravity

Details In Search of Fundamental Discreteness in 2+1 Dimensional Quantum Gravity In Search of Fundamental Discreteness in 2+1 Dimensional Quantum Gravity

2009-06-18

arxiv.org/abs/0906.3547v1

Class.Quant.Grav.26:185011,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

29 pages, 18 figures

Scientific paper

10.1088/0264-9381/26/18/185011

Inspired by previous work in 2+1 dimensional quantum gravity, which found evidence for a discretization of time in the quantum theory, we reexamine the issue for the case of pure Lorentzian gravity with vanishing cosmological constant and spatially compact universes of genus larger than 1. Taking as our starting point the Chern-Simons formulation with Poincare gauge group, we identify a set of length variables corresponding to space- and timelike distances along geodesics in three-dimensional Minkowski space. These are Dirac observables, that is, functions on the reduced phase space, whose quantization is essentially unique. For both space- and timelike distance operators, the spectrum is continuous and not bounded away from zero.

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