Violation of Universal Operator Growth Hypothesis in $W_3$ Conformal Field Theories

Abstract: We show that a large central charge conformal field theory with $W_3$ symmetry exhibits violation of the conjectured operator growth bound if the Liouvillian is modified to incorporate $W_3$ generators. We get 23 classes of Lanczos coefficients, obtained by the action of the Liouvillian on a descendant state. Among these, 10 classes of Lanczos coefficients violate the conjectured upper bound by exhibiting a faster than linear growth with descendant level $N$. Two classes of them have asymptotic growth saturating at $N^2$.