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Time operator in string theory

  1. Mar 24, 2013 #1


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    In covariant quantization of the string, say as in David Tong's http://arxiv.org/abs/0908.0333 (p28), time is an operator.

    Is the time operator Hermitian, and does it correspond to an observable?
  2. jcsd
  3. Mar 25, 2013 #2


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    This time operator is something like a local field operator defined on the world sheet. It can't be an observable b/c it's subject to (unphysical) local symmetries and related constraints.
  4. Mar 25, 2013 #3


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    But it is still an operator on an extended unconstrained space, containing the physical constrained space as a subspace.

    For some applications of this idea see e.g.
    especially Sec. 5.2.
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