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I asked a question a while a go what is a bound state and the question was closed because there is a similar question.

Now since best description we have to describe nature in quantum field theory How we define bound states in quantum field theory?

Qmechanic
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amilton moreira
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    A bound state is basically a stable state of two or more fundamental particles, eg. protons, neutrons, pions are all bound state of quarks and gluons. Glueballs are bound states of gluons, etc. – Prahar Aug 11 '23 at 17:25
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    One way to identify bound states is via poles in the S-matrix. For example, see https://physicscourses.colorado.edu/phys5250/phys5250_fa19/lecture/lec14-bound-states/ – Andrew Aug 11 '23 at 21:31
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    this may answer https://arnold-neumaier.at/physfaq/topics/bound.html – anna v Aug 12 '23 at 04:02

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