Lorentzian spinfoam propagator
General Relativity and Quantum Cosmology
2012-12-14 v2
Abstract
The two-point correlation function is calculated in the Lorentzian EPRL spinfoam model, and shown to match with the one in Regge calculus in a proper limit: large boundary spins, and small Barbero-Immirzi parameter, keeping the size of the quantum geometry finite and fixed. Compared to the Euclidean case, the definition of a Lorentzian boundary state involves a new feature: the notion of past- and future-pointing intertwiners. The semiclassical correlation function is obtained for a time-oriented semiclassical boundary state.
Cite
@article{arxiv.1109.6538,
title = {Lorentzian spinfoam propagator},
author = {Eugenio Bianchi and You Ding},
journal= {arXiv preprint arXiv:1109.6538},
year = {2012}
}
Comments
13 pages, minor changes, references added