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Pauli exclusion principle

  1. Sep 13, 2004 #1
    Could the Pauli exclusion principle be due to a force that
    has a 1 / r dependency where r is the distance between two electrons.
    Then in the case of electron degeneracy pressure in neutron stars
    could we say that uncertainty in momentum x uncertainty in position
    arises from a repulsive force - reducing r to 1/2 its value would double
    the repulsive force and the momentum if mv x position = 10^-34 = constant
    and m stays approximately constant.When two electrons have opposite spins
    the force would be attractive (in analogy to electric charges of opposite sign attracting each other).
    Last edited: Sep 13, 2004
  2. jcsd
  3. Sep 13, 2004 #2
    How did you come to this ??? What exactly is this force you are referring to.
    I think this is quite speculative...

    The Pauli-principle has to do with the antisymmetry of the fermion wave-function as predicted by QM. So why this force ???

  4. Sep 13, 2004 #3


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    No. Think about a simple two electrons atom. If the electrons have different quantum numbers, there is no force of this nature between them. Surely, your force would have been observed in atoms a long time ago!


  5. Sep 13, 2004 #4
    There is a post on sci.physics.research where someone asked if a force could be the explanation instead of the antisymmetrical wavefunction.I was wondering if
    anyone had ever tried in the past to use a force type explanation.
  6. Sep 13, 2004 #5


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    I understand what you are saying. My point is that whenever something is introduced, one must make sure that it is in agreement with *all* known experimental observations. That's why it's so hard to introduce new theories :smile: .

    As for your question, the first thing to check when introducing a new type of force between electrons is that it does not conflict with any of the experimental success of usual QM. Now, It's true that one could argue for a very short range force so that it could maybe act only extreme condition such as white dwarves and neutron stars, but I still think it would be hard to not conflict with the extremely precise measurements of helium type atoms, which agree so far with QED. (But I might be wrong.)

    Of course, other problesm pop up when you start thinking more seriously about this idea. For example, what would explain the Table of elements if there is no Pauli principle? (could this force explain the pattern of the elements and at the same time yields the standard results of QED for helium, etc???) It's hard to imagine.


  7. Sep 13, 2004 #6
    I agree with you but it would be nice to have a force and not a principle!
  8. Sep 13, 2004 #7
    In the relation:
    uncertainty in momentum x uncertainty in position = constant

    are the uncertainties average uncertainties - is the right hand side of the equation an absolute or average value?
  9. Sep 13, 2004 #8
    I think there is no new force involved, even though that would be great and exciting news !
    You can take a look at :
    R. F. Streater and A. S. Wightman's PCT, Spin and Statistics, and All That, reprinted by Addison-Wesley, New York, 1989
    or check : this by John Baez.
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