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Light like interval in wave function

  1. Feb 10, 2015 #1
    I have read the following from what seems a reliable source:

    The identification of the spacetime interval with quantum phase applies to null intervals as well, consistent with the fact that the quantum phase of a photon does not advance at all between its emission and absorption. Hence the physical significance of a null spacetime interval is that the quantum state of any system is constant along that interval.


    I have two questions: (1) Is this correct; (2) if it is correct, what is the physical significance of the value of the constant? So, for instance, what would it mean were the constant equal to one?
    Last edited: Feb 10, 2015
  2. jcsd
  3. Feb 10, 2015 #2


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    Science Advisor

    It's best to give a reference and/or link to one's "reliable source" -- so that potential helpers can see the context.
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