Observables in 3d spinfoam quantum gravity with fermions

Details Observables in 3d spinfoam quantum gravity with fermions Observables in 3d spinfoam quantum gravity with fermions

2010-03-09

arxiv.org/abs/1003.1847v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

32 pages, many diagrams, uses psfrag

Scientific paper

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 it to the case of massless fermionic fields. We introduce observables, analyse their symmetries and the corresponding proper gauge fixing. The Berezin integral over the fermionic fields is performed and the fermionic observables are expanded in open paths and closed loops associated to pure quantum gravity observables. We obtain the vertex amplitudes for gauge-invariant observables, while the expectation values of gauge-variant observables, such as the fermion propagator, are given by the evaluation of particular spin networks.

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