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Why can't we perceive extra dimensions?

  1. May 8, 2015 #1
    String theorists postulate that our world has 9 dimensions and these extra dimensions are very twisted up such that they are too small to be seen.

    Question 1:
    Why don't we postulate, instead, that the reason we can't see these extra dimensions is because we are not genetically wired to do so, just like a fish or a worm is not genetically wired to understand economics?

    Question 2:
    What does it mean for these dimensions to be twisted up? Twisted up in where? What I imagine is these dimensions are twisted like a tiny ball of threads; they would be twisted in our macro 3-dimensional space. If so, this picture seems wrong because then they are still existing in our 3-dimensional space, not really being extra-dimensional.
  2. jcsd
  3. May 8, 2015 #2

    Simon Bridge

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    Q1: that's just the same statement but more general and without any testable predictions - i.e. it is "begging the question".
    What is it about our genetic wiring that prevents us from seeing the extra dimensions?

    Q2: "twisted up" = "lots of curvature". It's maths.
    They are not curved in space (in a sense they are space), but have intrinsic curvature like regular spacetime does only more of it.
  4. May 8, 2015 #3
    Or maybe some people have the genes that allow them to see the extra dimensions. But when they say they do, we don't believe them.
  5. May 8, 2015 #4


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    That is, quite literally, not physically possible. At all. Thread locked since we don't allow speculation of this nature.
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