LETTER TO THE EDITOR: On the dimensionality of spacetime

  title={LETTER TO THE EDITOR: On the dimensionality of spacetime},
  author={Max Tegmark},
  journal={Classical and Quantum Gravity},
  • Max Tegmark
  • Published 25 February 1997
  • Physics
  • Classical and Quantum Gravity
Some superstring theories have more than one effective low-energy limit corresponding to classical spacetimes with different dimensionalities. We argue that all but the (3 + 1)-dimensional one might correspond to `dead worlds', devoid of observers, in which case all such ensemble theories would actually predict that we should find ourselves inhabiting a (3 + 1)-dimensional spacetime. With more or less than one time dimension, the partial differential equations of nature would lack the… 

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