Physics question! Is it possible in a quantum field theory (e.g. Klein-Gordon, but also interactive QFTs) to compute the spectrum of the field operators or their conjugate momenta? Or only of other operators?
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Ah, I see.. to be frank the answer is no .. it’s not as clean as QM :’(
One thing we do in a confining theory is write down all the gauge invariant operators. This is how we get the meson and baryon spectrums We can also predict goldstone or pseudo goldstone bosons vía goldstones theorem
