395 citations · 878 across the 14 of their papers we have counts for
8 papers · 1 filter
General Relativity versus Dark Matter for rotating galaxies
Yogendra Srivastava, Giorgio Immirzi, John Swain +2
A very general class of axially-symmetric metrics in general relativity (GR) that includes rotations is used to discuss the dynamics of rotationally-supported galaxies. The exact v…
Causal spin foams
Giorgio Immirzi
I discuss how to impose causality on spin-foam models, separating forward and backward propagation, turning a given triangulation to a 'causal set', and giving asymptotically the e…
A note on the spinor construction of Spin Foam amplitudes
Giorgio Immirzi
I discuss the use of spinors in the construction of spin-foam models, in particular the form of the closure and simplicity constraints for triangles that are space-like, i.e. with…
Quantum Gravity and Regge Calculus
Giorgio Immirzi
This is an informal review of the formulation of canonical general relativity and of its implications for quantum gravity; the various versions are compared, both in the continuum…
Real and complex connections for canonical gravity
Giorgio Immirzi
Both real and complex connections have been used for canonical gravity: the complex connection has SL(2,C) as gauge group, while the real connection has SU(2) as gauge group. We sh…
Quantizing Regge calculus
Giorgio Immirzi
A discretized version of canonical gravity in (3+1)-d introduced in a previous paper is further developed, introducing the Liouville form and the Poisson brackets, and studying the…