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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Oh, vacuum expectation value. No, that's one number. I want the spectrum of the operator!
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Ah, I see.. to be frank the answer is no .. it’s not as clean as QM :’(
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A vev?
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vacuum expectation value i don't know anything else b/c i'm trash but i hope i helped
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