46 citations · 85 across the 4 of their papers we have counts for
4 papers
Barrett-Crane spin foam model from generalized BF-type action for gravity
Richard E. Livine, Daniele Oriti
We study a generalized action for gravity as a constrained BF theory, and its relationship with the Plebanski action. We analyse the discretization of the constraints and the spin…
Immirzi parameter in the Barrett-Crane model?
Richard E. Livine
We study the generalised constrained BF theory described in gr-qc/0102073 in order to introduce the Immirzi parameter in spin foam models. We show that the resulting spin foam mode…
Length versus time-interval discreteness in 2+1 Lorentzian canonical quantum gravity
Richard Livine, Carlo Rovelli
Paper withdrawn. Replaced by by gr-qc/0212077 .
Fast rotation of strange stars
E. Gourgoulhon, P. Haensel, R. Livine +3
Exact models of uniformly rotating strange stars, built of self bound quark matter, are calculated within the framework of general relativity. This is made possible thanks to a new…