Putting a cap on causality violations in CDT
General Relativity and Quantum Cosmology
2008-11-26 v1 High Energy Physics - Theory
Abstract
The formalism of causal dynamical triangulations (CDT) provides us with a non-perturbatively defined model of quantum gravity, where the sum over histories includes only causal space-time histories. Path integrals of CDT and their continuum limits have been studied in two, three and four dimensions. Here we investigate a generalization of the two-dimensional CDT model, where the causality constraint is partially lifted by introducing weighted branching points, and demonstrate that the system can be solved analytically in the genus-zero sector.
Keywords
Cite
@article{arxiv.0709.2784,
title = {Putting a cap on causality violations in CDT},
author = {J. Ambjorn and R. Loll and W. Westra and S. Zohren},
journal= {arXiv preprint arXiv:0709.2784},
year = {2008}
}
Comments
17 pages, 4 figures