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Does an electron have a known diameter and rest mass?

  1. Apr 26, 2005 #1
    I'm still very confused to some extent.
    I know that from QM, an electron, due to Heisenbergs UP can't be measured definitely. It is following Schrödingers equation, and is presented as a vector in Hilbert space ,i.e. in a "electron cloud" of propability.

    But here my theory is incomplete. I've read some things about when a measurement is made (lets not go into detail about what kind of measurement), possible states are reduced (wave collapse), creating a classical part.
    Decoherence is the process the propability wave undergoes due to interaction and "continuous" measurement with environment. In this way, the quantum system is continuously measured, resulting in a "stable" (can be macroscopic) system. So according to what I read and decoherence told me, from the moment a classical system is created, its states are reduced, wave -function collapsed, and stay classical, due to constant environmental measurement upon...
    So I think the electron that has been created along with the other parts of the system, is constantly measured, allowing no more a superposition state, leaving you, according to me, with a classical particle.
    How then, can a well defined classical system, created by decoherence, that is able to stay stable thru constant environmental interaction, be build up of particles that can in some way or another still be superposed?
    Last edited: Apr 27, 2005
  2. jcsd
  3. Apr 27, 2005 #2
    No and yes.
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