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  Non-perturbative Lorentzian Quantum Gravity, Causality and Topology Change

Ambjörn, J., & Loll, R. (1998). Non-perturbative Lorentzian Quantum Gravity, Causality and Topology Change. Nuclear Physics B, 536(1-2), 407-434. doi:10.1016/S0550-3213(98)00692-0.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-5916-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-5917-1
Genre: Journal Article

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9805108v1.pdf (Preprint), 312KB
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 Creators:
Ambjörn, Jan, Author
Loll, Renate1, Author
Affiliations:
1Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:24014              

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 Abstract: We formulate a non-perturbative lattice model of two-dimensional Lorentzian quantum gravity by performing the path integral over geometries with a causal structure. The model can be solved exactly at the discretized level. Its continuum limit coincides with the theory obtained by quantizing 2d continuum gravity in proper-time gauge, but it disagrees with 2d gravity defined via matrix models or Liouville theory. By allowing topology change of the compact spatial slices (i.e. baby universe creation), one obtains agreement with the matrix models and Liouville theory.

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 Dates: 1998-12-21
 Publication Status: Published in print
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 Identifiers: eDoc: 206258
Other: arXiv:hep-th/9805108v1
DOI: 10.1016/S0550-3213(98)00692-0
URI: http://arxiv.org/abs/hep-th/9805108
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Title: Nuclear Physics B
Source Genre: Journal
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Pages: - Volume / Issue: 536 (1-2) Sequence Number: - Start / End Page: 407 - 434 Identifier: ISSN: 0550-3213