G I Gomero 2003 Class. Quantum Grav. 20 4775 doi:10.1088/0264-9381/20/22/004
G I Gomero
Show affiliationsSuppose we have identified three clusters of galaxies as being topological copies of the same object. How does this information constrain the possible models for the shape of our universe? It is shown here that, if our universe has flat spatial sections, these multiple images can be accommodated within any of the six classes of compact orientable three-dimensional flat space forms. Moreover, the discovery of two more triples of multiple images in the neighbourhood of the first one would allow the determination of the topology of the universe, and in most cases the determination of its size.
Issue 22 (21 November 2003)
Received 6 May 2003
Published 3 October 2003
G I Gomero 2003 Class. Quantum Grav. 20 4775
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