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Waves - bound and unbound states

  1. Jul 29, 2009 #1
    I was thinking about bound and unbound states the other day and want to know:

    Is unboundedness a requirement for a traveling wave? That is, if you were to build a beams from bound states, would they become standing waves?
  2. jcsd
  3. Jul 29, 2009 #2
    Well one can decompose a travelling wave solution into an infinite sum of bound states. it's all in the time dependent coefficients.
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