Cosmological Deformation of Lorentzian Spin Foam Models

Details Cosmological Deformation of Lorentzian Spin Foam Models Cosmological Deformation of Lorentzian Spin Foam Models

2002-11-29

arxiv.org/abs/gr-qc/0211109v1

Class.Quant.Grav. 20 (2003) 3175-3214

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

37 pages, 7 figures included

Scientific paper

10.1088/0264-9381/20/14/318

We study the quantum deformation of the Barrett-Crane Lorentzian spin foam model which is conjectured to be the discretization of Lorentzian Plebanski model with positive cosmological constant and includes therefore as a particular sector quantum gravity in de-Sitter space. This spin foam model is constructed using harmonic analysis on the quantum Lorentz group. The evaluation of simple spin networks are shown to be non commutative integrals over the quantum hyperboloid defined as a pile of fuzzy spheres. We show that the introduction of the cosmological constant removes all the infrared divergences: for any fixed triangulation, the integration over the area variables is finite for a large class of normalization of the amplitude of the edges and of the faces.

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