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Non-Interacting Particles

  1. Dec 11, 2009 #1
    I just wanted to clarify something conceptual with non-interacting particles. So if you have three identical non-interacting fermions (say electrons), is it true that they are distinguishable (since they're non-interacting)? Or are they indistinguishable since they're still identical?
  2. jcsd
  3. Dec 11, 2009 #2
    No, the indistinguishability of the electrons is also present in the absence of interactions. Any wavefunction of the electrons is anti-symmetrized. So although the electrons do not interact, they still feel some form of repelment as they cannot occupy the same state.

    It's ofcourse a mathematical statement, since non-interacting particles can hardly be considered physical.
  4. Dec 11, 2009 #3
    Ok thanks. So basically: even though they're non-interacting, they're still indistinguishable and they obey the Pauli exclusion principle. Correct?
  5. Dec 11, 2009 #4
    Yes, indeed.
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