89 citations · 481 across the 12 of their papers we have counts for
5 papers · 1 filter
Simplicity and closure constraints in spin foam models of gravity
Sergei Alexandrov
We revise imposition of various constraints in spin foam models of 4-dimensional general relativity. We argue that the usual simplicity constraint must be supplemented by a constra…
Immirzi parameter and fermions with non-minimal coupling
Sergei Alexandrov
We clarify the role played by the Immirzi parameter in classical gravity coupled to fermions. Considering the general non-minimal coupling, we show that, although the torsion depen…
Spin foam model from canonical quantization
Sergei Alexandrov
We suggest a modification of the Barrett-Crane spin foam model of 4-dimensional Lorentzian general relativity motivated by the canonical quantization. The starting point is Lorentz…
Plebanski Theory and Covariant Canonical Formulation
Sergei Alexandrov, Eric Buffenoir, Philippe Roche
We establish an equivalence between the Hamiltonian formulation of the Plebanski action for general relativity and the covariant canonical formulation of the Hilbert-Palatini actio…
On the counting of black hole states in loop quantum gravity
Sergei Alexandrov
We argue that counting black hole states in loop quantum gravity one should take into account only states with the minimal spin at the horizon.