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Bethe-Salpeter equation confused

  1. Nov 27, 2005 #1
    Dear PF,

    Im reading something about bound states & there I one question.
    The Bethe-Salpeter equation for a bound pair B deals with the amplitude:

    Phi (x,y)=<0|TPsi(x)Psi_bar(y)|B>, |B> is a bound pair state, <0| vacuum...what i missunderstand how it can be the transition between some bound state and vacuum? What about conseravation rules..
    Or generally what amplitude is it what transition does it describe?

    If I even wright something bad pls correct me.

    Any books where this is described?
  2. jcsd
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