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Why only three non curled up spatial dimensions?

  1. Dec 27, 2008 #1
    Why only three "non curled up" spatial dimensions?

    Is there a reason (inherent in the theory) that string theory describes 10 spatial dimensions with 7 of them curled up rather than having 8 or 3 curled up? In other words, is this curling up a consequence of other parts of string theory, or is string theory designed as to fit observation?
  2. jcsd
  3. Dec 27, 2008 #2
    Re: Why only three "non curled up" spatial dimensions?

    They're not curled?
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