Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2006-11-20
Class.Quant.Grav.24:1605-1614,2007
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
10 pages, version to appear in Classical and Quantum Gravity
Scientific paper
10.1088/0264-9381/24/6/014
The familiar Bang/Crunch singularities of classical cosmology have recently been augmented by new varieties: rips, sudden singularities, and so on. These tend to be associated with final states. Here we consider an alternative possibility for the initial state: a singularity which has the novel property of being inaccessible to physically well-defined probes. These singularities arise naturally in cosmologies with toral spatial sections.
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