Title:	A 2D model of causal set quantum gravity: the emergence of the continuum
Authors:	Brightwell, Graham Henson, Joe Surya, Sumati
Issue Date:	May-2008
Publisher:	Institute of Physics Publishing (IOP)
Citation:	Classical and Quantum Gravity, 2008, Vol.25, 105025
Abstract:	Non-perturbative theories of quantum gravity inevitably include configurations that fail to resemble physically reasonable spacetimes at large scales. Often, these configurations are entropically dominant and pose an obstacle to obtaining the desired classical limit. We examine this 'entropy problem' in a model of causal set quantum gravity corresponding to a discretization of 2D spacetimes. Using results from the theory of partial orders we show that, in the large volume or continuum limit, its partition function is dominated by causal sets which approximate to a region of 2D Minkowski space. This model of causal set quantum gravity thus overcomes the entropy problem and predicts the emergence of a physically reasonable geometry.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/3623
ISSN:	E-ISSN: 1361-6382 P-ISSN: 0264-9381
Alternative Location:	http://arxiv.org/abs/0706.0375 http://dx.doi.org/10.1088/0264-9381/25/10/105025
Copyright:	2008 IOP Publishing
Appears in Collections:	Research Papers (TP)

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