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As the only way String theory can respect the principles of quantum mechanics and Special theory of relativity, by formulating it in hypothetical nine dimensional space. You could use string compactification for d number of non compact direction, all it requires to have d non compact direction is to choose an appropriate compact space of dimension (9-d). The question arises here, Then Why our Universe is in Three dimensional space? |
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M - Theory suggests that the universe we live in is a D-brane. D branes comes in different dimensionalities from the D25 to D0. There is no known compelling reason why a particular configuration of D branes, compact spaces and the laws of physics are prefered over the others. The current view is that all possibilities can happen in the multiverse, so maybe is kind of lucky that this particular configuration, that we call the universe, is stable and have all the constants tuned for us to observe it. |
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