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**towards a spin foam model of quantum gravity**

Hi -

You can see the transparencies of my talk at Loops '05 here:

Towards a Spin Foam Model of Quantum Gravity

I've changed the title from what appears in http://loops05.aei.mpg.de/" [Broken]. I've also changed my abstract. Here it is:

Spin foam models include several different classes of physical theories: lattice gauge theories, dynamical triangulation models of quantum gravity, "chain mail" quantum field theories, and topological string theories. Is there a spin foam model of quantum gravity in 4 dimensions? To address this question, we review recent work on causal dynamical triangulations and the renormalization group. This suggests that quantum gravity is a well-defined theory with the curious property that spacetime is effectively 4-dimensional at large distance scales, but 2-dimensional at very short distance scales. This is just what one might expect from a spin foam model, since spacetime is fundamentally 2-dimensional in these theories. We discuss properties a spin foam model should have in order to approximate general relativity at large distance scales.

I refer to a bunch of papers in my talk, but you can more easily get to those papers "[URL [Broken] my webpage[/URL].

My grad students Jeffrey Morton, Derek Wise and I are flying to Berlin this Saturday... this is gonna be fun!

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