Why only three non curled up spatial dimensions?

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String theory posits a total of 10 spatial dimensions, with 7 of these dimensions being "curled up." This configuration is not arbitrary; it arises from the mathematical framework of string theory itself, which is designed to reconcile quantum mechanics and general relativity. The specific number of curled dimensions is a consequence of the theory's requirements to match observed physical phenomena, rather than a mere fit to observations. The discussion emphasizes that the structure of string theory inherently dictates these dimensional characteristics.

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nealh149
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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?
 
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nealh149 said:
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?

They're not curled?
 

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