| L. Crane. A new approach to the geometrization of matter. gr-qc/0110060, 2001. |
....local excitations) the author appeals to certain symmetry breaking of topological invariance. Crane s other proposal consists of interpreting topological (conical) singularities naturally arising in the structure of the Feynman diagrams of the GFT theory as representing matter degrees of freedom [117]. 7. Alternatives to the Barrett Crane model The fact that degenerate con gurations dominate the Barrett Crane amplitudes[93] or that the modi cations of the model in compliance with the principles of Plebanski s formulation contain only degenerate con gurations[96] pose serious diculties in ....
L. Crane. A new approach to the geometrization of matter. gr-qc/0110060, 2001.
....are localized structures, or tangles, in G. The above ideas have all been discussed previously by researchers in quantum gravity: in particular, that spacetime is a causal network arising from graph updating rules [13] that particles could arise as topological defects in such a network [16]; and that dimension and other geometric properties can be defined solely in terms of the network s connectivity pattern [17] The main di#erence we can discern between Wolfram s model and earlier ones is that Wolfram s is explicitly classical. Indeed, Wolfram requires the network evolution to be ....
L. Crane (2001), A new approach to the geometrization of matter, gr-qc/0110060.
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