Putting a cap on causality violations in CDT

Details Putting a cap on causality violations in CDT Putting a cap on causality violations in CDT

2007-09-18

arxiv.org/abs/0709.2784v1

JHEP0712:017,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

17 pages, 4 figures

Scientific paper

10.1088/1126-6708/2007/12/017

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.

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