Hi All,
In the Feynman, 'sum over paths' approach to quantum field theory, we compute amplitudes, generating functionals etc by feeding in a "classical action".
By calling the Lagrangian that we feed in "classical", this mean that the fields that feature in that action are regarded as classical fields? (Is there even such a thing as a classical field for a proton, etc?!)
I'm quite perplexed by this, so any sage words at all would be much appreciated!
In the Feynman, 'sum over paths' approach to quantum field theory, we compute amplitudes, generating functionals etc by feeding in a "classical action".
By calling the Lagrangian that we feed in "classical", this mean that the fields that feature in that action are regarded as classical fields? (Is there even such a thing as a classical field for a proton, etc?!)
I'm quite perplexed by this, so any sage words at all would be much appreciated!
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