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Homework Help: Zwiebach page 194

  1. Oct 20, 2007 #1
    1. The problem statement, all variables and given/known data
    I am confused about Quick Calculation 11.3. What does he mean "by viewing x_0^I as the explicitly time-dependent Heisenberg operator defined by (11.38)"?

    Specifically, what does "viewing" mean?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Oct 20, 2007 #2
    This one is not clear to me either. However, what I did was assume that [itex]x_0^I[/itex] does have explicit time dependence by rewriting equation (11.38) on page 193 as

    [tex]x_0^I(\tau) = x^I(\tau) - \frac{p^I}{m^2}\tau[/tex]

    and then showing that the derivative w.r.t. [itex]\tau[/itex] is zero. It's not hard enough to justify a QC though.
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