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VOLUME 57 | ISSUE 10 | PAGE 622
New restrictions on spatial topology of the universe from microwave background temperature fluctuations
If the Universe has the topology of a 3-torus (Γ3), then it follows from recent data on the large-scale temperature fluctuations, Δ7ΥΓ, of the cosmic microwave background that either the minimal size of the torus is at least on the order of the present cosmological horizon or the large-scale Δ TV Γ pattern should have a symmetry plane (in the case of the effective Γ1 topology), or a symmetry axis (in the case of the effective Γ2 topology). The latter possibility can probably be ruled out by the data.

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