Out-of-time-ordered correlators in a (T2)n / Zn CFT

Abstract

In this paper we continue analyzing the nonequilibrium dynamics in the (T2)n/Zn orbifold conformal field theory. We compute the out-of-time-ordered four-point correlators with twist operators. For rational η(=p/p′) which is the square of the compactification radius, we find that the correlators approach nontrivial constants at late time. For n=2 they are expressed in terms of the modular matrices and for higher n orbifolds are functions of pp′ and n. For irrational η, we find a new polynomial decay of the correlators that is a signature of an intermediate regime between rational and chaotic models.