Quantum triviality means that removal of the cutoff forces the renormalized interaction to vanish, leaving a free continuum theory. Keeping a nonzero interaction then requires treating the model as an effective theory with finite cutoff.
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Quantum triviality is a concept that arises in the context of quantum field theory, particularly in the study of certain types of quantum field theories and their behavior at different energy scales. The term often applies to theories that do not have the capacity to produce non-trivial dynamics or effective interactions in the quantum regime.