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Photons Super/sub luminal

  1. Aug 8, 2014 #1


    Staff: Mentor

    In Feynman's famous book QED, he repeatedly reminds us that we must include the possibilities of photons traveling faster than light and slower than light to get the right answers. At least for short distances, short times. For longer distances, longer times, those possibilities cancel and the average speed, c, is adequate.

    Is this because of uncertainty, or a fluke in the math, or some other physics?
  2. jcsd
  3. Aug 8, 2014 #2

    Vanadium 50

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    Where does he say that?
  4. Aug 8, 2014 #3


    Staff: Mentor

    He mentions the same thing several times in QED: The Strange Theory of Light and Matter .

    I found my question in another PF thread here but the answers seemed contradictory and unclear.
  5. Aug 8, 2014 #4


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