248 citations · 338 across the 6 of their papers we have counts for
7 papers
Asymptotics of 4d spin foam models
John W. Barrett, Richard J. Dowdall, Winston J. Fairbairn +3
We study the asymptotic properties of four-simplex amplitudes for various four-dimensional spin foam models. We investigate the semi-classical limit of the Ooguri, Euclidean and Lo…
Observables in 3d spinfoam quantum gravity with fermions
Richard J. Dowdall, Winston J. Fairbairn
We study expectation values of observables in three-dimensional spinfoam quantum gravity coupled to Dirac fermions. We revisit the model introduced by one of the authors and extend…
Wilson loops, geometric operators and fermions in 3d group field theory
R. J. Dowdall
Group field theories whose Feynman diagrams describe 3d gravity with a varying configuration of Wilson loop observables and 3d gravity with volume observables at each vertex are de…
Asymptotic analysis of the Ponzano-Regge model for handlebodies
R. Dowdall, Henrique Gomes, Frank Hellmann
Using the coherent state techniques developed for the analysis of the EPRL model we give the asymptotic formula for the Ponzano-Regge model amplitude for non-tardis triangulations…
A Summary of the asymptotic analysis for the EPRL amplitude
John W. Barrett, Richard J. Dowdall, Winston J. Fairbairn +2
We review the basic steps in building the asymptotic analysis of the Euclidean sector of new spin foam models using coherent states, for Immirzi parameter less than one. We focus o…
Lorentzian spin foam amplitudes: graphical calculus and asymptotics
John W. Barrett, Richard J. Dowdall, Winston J. Fairbairn +2
The amplitude for the 4-simplex in a spin foam model for quantum gravity is defined using a graphical calculus for the unitary representations of the Lorentz group. The asymptotics…