Publicação: Determining the shape of the universe using discrete sources
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Iop Publishing Ltd
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Suppose 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.
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Classical and Quantum Gravity. Bristol: Iop Publishing Ltd, v. 20, n. 22, p. 4775-4784, 2003.
