From: socratus1944@gmail.com   
      
   > Is there a name for the QFT with two real fields. \psi and \phi, and   
   > interaction   
   >   
   >      g \psi^2 \phi^2,   
   >   
   > where obviously g should be positive and both fields are Klein-Gordon   
   > fields which may or may not have mass. The descriptive name in the title   
   > could of course be used, but is this system known under a special name?   
   >   
   > (I'm interested since it looks like the simplest example of two   
   > interacting fields and perhaps the wave functional of its solutions   
   > could be visualized..)   
      
   [Moderator's note:  I have added the quoted text above to supply some   
   context. -P.H.]   
      
    The subject is QFT   
   And you try to understand interaction between   
   the Schrödinger and the Dirac equations   
   (that is hidden in the Klein-Gordon fields equation) . . .   
   . . .   if i understood correctly   
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