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Line 1: {{short description\|Class of operators in quantum field theory}} In [[statistical mechanics]] and [[quantum field theory]], a '''dangerously irrelevant operator''' (or '''dangerous irrelevant operator''') is an [[operator (mathematics)\|operator]] which is irrelevant at a renormalization group fixed point, yet affects the [[infrared]] (IR) physics significantly (e.g. because the [[vacuum expectation value]] (VEV) of some field depends sensitively upon the coefficient of this operator).

Dangerously irrelevant operator: Difference between revisions