Towards a Spin Foam Model of Quantum Gravity
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NOTE: pdf link for transparencies-
http://math.ucr.edu/home/baez/loops05/loops05.pdf
Probably not everyones cup of tea. A clip from a lecture by John Baez in conjunction with the LOOPS 'O5 series by the Max Planck Institute of Gravitation (Albert Einstein Institute) regarding a proposal for quantum gravity (the clip appears to start at page 14 of the transparencies). Date- 11th Oct 05. Source- http://math.ucr.edu/home/baez/loops05/
LOOPS '05- http://loops05.aei.mpg.de/
'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.'
Added on Nov 6, 2009 by deek
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quantum gravity general relativity grand unified theory of everything GUT TOE john baez
Major questions in astronomy
quantum gravity general relativity grand unified theory of everything GUT TOE john baez
Major questions in astronomy
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