Putting a cap on causality violations in CDT

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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.
17 pages, 4 figures

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General Relativity and Quantum Cosmology, High Energy Physics - Theory

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http://salesiana.dossiersoluciones.com/handle/123456789/193665

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0709.2784
 http://arxiv.org/abs/0709.2784
 JHEP0712:017,2007
 doi:10.1088/1126-6708/2007/12/017

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arXiv