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Probability of staying in same state after time-dep perturbation?

  1. Apr 2, 2008 #1
    Let's say that you've got a time-dependent perturbation to your potential (say, the particle-in-a-box to make things simple). Say you start in energy eigenstate #3. What's the probability that the particle will stay in eigenstate 3 after time T?

    This is not a homework problem. I'm not understanding the equation for the probability which seems to give a number larger than 1.
     
  2. jcsd
  3. Apr 3, 2008 #2
    I take you're staring at Fermi's Golden Rule. That rule is a first order time dependent perturbation result, and so will not give the correct answer at large times or for large perturbations.
     
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