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Strings vs blocks

  1. Jan 21, 2009 #1
    Why do strings only have one dimension (or maybe branes have 2 dimensions)? Why aren't oscillating volumes (like a cube) used?
     
  2. jcsd
  3. Jan 22, 2009 #2
    Symmetry and minimization of energy.

    Your question is a good one, and one I think any intelligent person should ask themselves at some point. It's actually somewhat equivalent to saying "why isn't the Sun a cube, or hexahedron?"
     
  4. Jan 22, 2009 #3

    Demystifier

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    If strings are replaced with objects extended in more dimensions, then ultraviolate divergences cannot longer be removed (at least not perturbatively). This happens only for extension in 1 dimension.
     
  5. Jan 22, 2009 #4
    whats about n-branes?
     
  6. Jan 24, 2009 #5
    I agree it is a good question and the answer lies in mathematics.

    There is no reason why theories involving more dimensions cannot be devised (and indeed they have already) but the mathematics involved becomes increasing more complex as you add more dimensions.
     
  7. Jan 26, 2009 #6

    Demystifier

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    It is still not known how to quantize them consistently.
     
  8. Jan 26, 2009 #7
    I don't know what it means, but thanks for the answer. So, string theory says that objects can only have one dimension due to a fundamental property of reality?
     
  9. Jan 26, 2009 #8
    Hmm, but string theorists use them regularly anyway don't they?
     
  10. Jan 27, 2009 #9

    Demystifier

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    Yes. They mostly use them as classical objects.
     
  11. Jan 27, 2009 #10
    Very interesting, thanks.
     
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