Causal Set Topology

Details Causal Set Topology Causal Set Topology

2007-12-11

arxiv.org/abs/0712.1648v2

Theor.Comput.Sci.405:188-197,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Typos fixed, references updated. Latex 22 pages, 3 figures

Scientific paper

The Causal Set Theory (CST) approach to quantum gravity is motivated by the observation that, associated with any causal spacetime (M,g) is a poset (M,<), with the order relation < corresponding to the spacetime causal relation. Spacetime in CST is assumed to have a fundamental atomicity or discreteness, and is replaced by a locally finite poset, the causal set. In order to obtain a well defined continuum approximation, the causal set must possess the requisite intrinsic topological and geometric properties that characterise a continuum spacetime in the large. The continuum approximation thus sets the stage for the study of topology in CST. We review the status of causal set topology and present some new results relating poset and spacetime topologies. The hope is that in the process, some of the ideas and questions arising from CST will be made accessible to the larger community of computer scientists and mathematicians working on posets.

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