Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-02-06
Class.Quant.Grav.15:2645-2656,1998
Astronomy and Astrophysics
Astrophysics
minor revision; 7 pages, 1 figure, accepted by Classical and Quantum Gravity
Scientific paper
10.1088/0264-9381/15/9/012
The space-like hypersurface of the Universe at the present cosmological time is a three-dimensional manifold. A non-trivial global topology of this space-like hypersurface would imply that the apparently observable universe (the sphere of particle horizon radius) could contain several images of the single, physical Universe. Recent three-dimensional techniques for constraining and/or detecting this topology are reviewed. Initial applications of these techniques using X-ray bright clusters of galaxies and quasars imply (weak) candidates for a non-trivial topology.
Blanloeil Vincent
Roukema Boudewijn F.
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