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String theory says that spacetime is really 10 dimensional and that 6 of these dimensions are curled up in a very small configuration. There is a lot of speculation as to what topology these 6 extra dimensions take. (Calabi-Yau topogologies, for example) Why not assume that they form a 6-D hypersphere? This would be the simplest and most obvious topology. Is there some physical reason that a 6-D sphere has been ruled out?
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