Out-Of-Time-Correlators for free and interacting field theories Posted by QuantumEyedea, at physics.stackexchange.com, 16 Feb 2022 Consider the Out-Of-Time-Correlator (OTOC) $$ \mathrm{Tr}\left[ - [ \phi(t,\mathbf{x}) , \phi(t',\mathbf{x}') ]^2 \rho\ \right…