On the semiclassical limit of 4d spin foam models
General Relativity and Quantum Cosmology
2010-04-30 v1 High Energy Physics - Theory
Abstract
We study the semiclassical properties of the Riemannian spin foam models with Immirzi parameter that are constructed via coherent states. We show that in the semiclassical limit the quantum spin foam amplitudes of an arbitrary triangulation are exponentially suppressed, if the face spins do not correspond to a discrete geometry. When they do arise from a geometry, the amplitudes reduce to the exponential of i times the Regge action. Remarkably, the dependence on the Immirzi parameter disappears in this limit.
Keywords
Cite
@article{arxiv.0809.2280,
title = {On the semiclassical limit of 4d spin foam models},
author = {Florian Conrady and Laurent Freidel},
journal= {arXiv preprint arXiv:0809.2280},
year = {2010}
}
Comments
32 pages, 5 figures