I'm wondering why correlation function is a more fundamental object in conformal field theory than the notion of particle. By conformal symmetry, I think we can still discuss about massless particle.
I'm wondering if there will be bound state and scattering state, those exists in quantum mechanics scattering theory, will they still work in CFT?
Also, I'm wondering why don't we draw Feynman diagram in CFT and why CFT don't have Lagrangian?
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