Geometrical measurements in three-dimensional quantum gravity

Abstract

A set of observables is described for the topological quantum field theory which describes quantum gravity in three space-time dimensions with positive signature and positive cosmological constant. The simplest examples measure the distances between points, giving spectra and probabilities which have a geometrical interpretation. The observables are related to the evaluation of relativistic spin networks by a Fourier transform.

This is the first of three lectures given at the Xth Oporto Meeting on Geometry, Topology and Physics, September 2001. v2: one typo corrected

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