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Can we view the string theory as defined on special 2-D time?

  1. Oct 17, 2009 #1
    Since now time is 2-dimensional, coordinates of points X[tex]\mu[/tex] are dependent on both ([tex]\tau[/tex]1, [tex]\tau[/tex]2), and
    if [tex]\tau[/tex]2 is infinite, it's a open string;
    if [tex]\tau[/tex]2 is finite, it's a closed string.

    How do you think so?
    Last edited: Oct 17, 2009
  2. jcsd
  3. Oct 19, 2009 #2


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    It is so, but it is not a second time, just a parameter, lets call sigma (for "space"). What you say is called the "worldsheet point of view", as oppossed to the 4D (or 10D) "space time point of view".
  4. Oct 19, 2009 #3
    As long as a (any) system has only one past and one future, it will have just one time parameter. There may be theories with signatures like (- - + + +...) - as in F-theory - but that alone does not mean it is a two-timed theory.
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