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Asymptotics of 10j symbols
John C. Baez, J. Daniel Christensen, Greg Egan
The Riemannian 10j symbols are spin networks that assign an amplitude to each 4-simplex in the Barrett-Crane model of Riemannian quantum gravity. This amplitude is a function of th…
Higher Yang-Mills Theory
John C. Baez
Electromagnetism can be generalized to Yang-Mills theory by replacing the group U(1)$ by a nonabelian Lie group. This raises the question of whether one can similarly generalize 2-…
Spin Foam Models of Riemannian Quantum Gravity
John C. Baez, J. Daniel Christensen, Thomas R. Halford +1
Using numerical calculations, we compare three versions of the Barrett-Crane model of 4-dimensional Riemannian quantum gravity. In the version with face and edge amplitudes as desc…
Uncertainty in Measurements of Distance
John C. Baez, S. Jay Olson
Ng and van Dam have argued that quantum theory and general relativity give a lower bound of L^{1/3} L_P^{2/3} on the uncertainty of any distance, where L is the distance to be meas…