Dear PF,(adsbygoogle = window.adsbygoogle || []).push({});

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.

Thks

Any books where this is described?

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# Bethe-Salpeter equation confused

Can you offer guidance or do you also need help?

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