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Quick question on field quanta

  1. Dec 29, 2012 #1
    what does it mean when someone says field quanta are not spatially localized?

    does it mean they are in superpostion or they are just moving very fast?

    sorry if I sound daft
  2. jcsd
  3. Dec 29, 2012 #2
    and are field quanta virtual particles that pop in and out of existence?

    I read "field quanta are not spatially localized since they are not excition states at a certain point of the field but have to be assigned to the field system as whole"

    can someone explain why they have to be assigned to the system as a whole?

    please help...
    Last edited: Dec 29, 2012
  4. Dec 29, 2012 #3


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    When describing a complex system we try to use the excitations which are simplest, namely the normal modes. For a free field the normal modes are the plane waves. A disturbance that was initially localized would not stay that way, it would spread to neighboring points and be rather difficult to deal with!
  5. Jan 7, 2013 #4
    what I dont get is when it says you must take into account the whole field.

    like these field quanta spread accross the whole universe, because the field is everywhere...
    Last edited: Jan 7, 2013
  6. Jan 7, 2013 #5
    I just dont get it when he says they are not exition states at a point in the field.

    what are they then? a single quantum is spread everywhere?

    please help...
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